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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
- "http://www.w3.org/TR/html4/loose.dtd">
-<html >
-<head><title>1 Introduction</title>
-<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
-<meta name="generator" content="TeX4ht (http://www.cis.ohio-state.edu/~gurari/TeX4ht/mn.html)">
-<meta name="originator" content="TeX4ht (http://www.cis.ohio-state.edu/~gurari/TeX4ht/mn.html)">
-<!-- html -->
-<meta name="src" content="pgfmanual.tex">
-<meta name="date" content="2005-11-15 18:41:00">
-<link rel="stylesheet" type="text/css" href="pgfmanual.css">
-</head><body
->
- <div class="crosslinks"><p class="noindent">[<a
-href="pgfmanualse2.html" >next</a>] [<a
-href="#tailpgfmanualse1.html">tail</a>] [<a
-href="pgfmanual.html#pgfmanualse1.html" >up</a>] </p></div>
- <h3 class="sectionHead"><span class="titlemark">1 </span> <a
- id="x2-30001"></a>Introduction</h3>
-<!--l. 11--><p class="noindent">The <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;package, where &#8220;<span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&#8221; is supposed to mean &#8220;portable graphics format&#8221; (or &#8220;pretty, good, functional&#8221; if
-you prefer...), is a package for creating graphics in an &#8220;inline&#8221; manner. The package defines a number of
-<span class="TEX">T<span
-class="E">E</span>X</span>&nbsp;commands that draw graphics. For example, the code <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\tikz</span><span
-class="cmtt-10">&nbsp;\draw</span><span
-class="cmtt-10">&nbsp;(0pt,0pt)</span><span
-class="cmtt-10">&nbsp;--</span><span
-class="cmtt-10">&nbsp;(20pt,6pt);</span></span></span> yields the
-line <object data="pgfmanual-3.svg" width="28.19987 " height="9.53328 " type="image/svg+xml"><p>SVG-Viewer needed.</p></object> and the code <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\tikz</span><span
-class="cmtt-10">&nbsp;\fill[orange]</span><span
-class="cmtt-10">&nbsp;(1ex,1ex)</span><span
-class="cmtt-10">&nbsp;circle</span><span
-class="cmtt-10">&nbsp;(1ex);</span></span></span> yields <object data="pgfmanual-4.svg" width="12.4814 " height="12.4814 " type="image/svg+xml"><p>SVG-Viewer needed.</p></object>.
-<!--l. 20--><p class="indent"> In a sense, when using <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;you &#8220;program&#8221; your graphics, just as you &#8220;program&#8221; your document
-when using <span class="TEX">T<span
-class="E">E</span>X</span>. This means that you get the advantages of the &#8220;<span class="TEX">T<span
-class="E">E</span>X</span>-approach to typesetting&#8221;
-also for your graphics: quick creation of simple graphics, precise positioning, the use of macros, often
-superior typography. You also inherit all the disadvantages: steep learning curve, no <span
-class="cmcsc-10"><small
-class="small-caps">W</small><small
-class="small-caps">Y</small><small
-class="small-caps">S</small><small
-class="small-caps">I</small><small
-class="small-caps">W</small><small
-class="small-caps">Y</small><small
-class="small-caps">G</small></span>, small
-changes require a long recompilation time, and the code does not really &#8220;show&#8221; how things will look
-like.
-<!--l. 31--><p class="noindent">
- <h4 class="subsectionHead"><span class="titlemark">1.1 </span> <a
- id="x2-40001.1"></a>Structure of the System</h4>
-<!--l. 33--><p class="noindent">The <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;system consists of different layers:
-<!--l. 35--><p class="indent">
- <dl class="description"><dt class="description">
-<span
-class="cmbx-10">System layer:</span> </dt><dd
-class="description">This layer provides a complete abstraction of what is going on &#8220;in the driver.&#8221; The driver
- is a program like <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">dvips</span></span></span> or <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">dvipdfm</span></span></span> that takes a <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.dvi</span></span></span> file as input and generates a <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.ps</span></span></span> or a <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.pdf</span></span></span> file.
- (The <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pdftex</span></span></span> program also counts as a driver, even though it does not take a <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.dvi</span></span></span> file as input. Never
- mind.) Each driver has its own syntax for the generation of graphics, causing headaches to everyone
- who wants to create graphics in a portable way. <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&#8217;s system layer &#8220;abstracts away&#8221; these differences.
- For example, the system command <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\pgfsys@lineto{10pt}{10pt}</span></span></span> extends the current path to the
- coordinate (10pt<span
-class="cmmi-10">,</span>10pt) of the current <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{pgfpicture}</span></span></span>. Depending on whether <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">dvips</span></span></span>, <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">dvipdfm</span></span></span>, or
- <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pdftex</span></span></span> is used to process the document, the system command will be converted to different <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\special</span></span></span>
- commands.
- <!--l. 51--><p class="noindent">The system layer is as &#8220;minimalistic&#8221; as possible since each additional command makes it more work to
- port <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;to a new driver. Currently, only drivers that produce PostScript or <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">D</small><small
-class="small-caps">F</small> </span>output are supported
- and only few of these (hence the name <span
-class="cmti-10">portable </span>graphics format is currently a bit boastful). However,
- in principle, the system layer could be ported to many different drivers quite easily. It should even be
- possible to produce, say, <span
-class="cmcsc-10"><small
-class="small-caps">S</small><small
-class="small-caps">V</small><small
-class="small-caps">G</small> </span>output in conjunction with <span
-class="cmcsc-10"><small
-class="small-caps">T</small><small
-class="small-caps">E</small><small
-class="small-caps">X</small>4<small
-class="small-caps">H</small><small
-class="small-caps">T</small></span>.
- <!--l. 61--><p class="noindent">As a user, you will not use the system layer directly.
- </dd><dt class="description">
-<span
-class="cmbx-10">Basic layer:</span> </dt><dd
-class="description">The basic layer provides a set of basic commands that allow you to produce complex graphics
- in a much easier way than by using the system layer directly. For example, the system layer provides no
- commands for creating circles since circles can be composed from the more basic B&eacute;zier curves (well,
- almost). However, as a user you will want to have a simple command to create circles (at least I do)
- instead of having to write down half a page of B&eacute;zier curve support coordinates. Thus, the basic layer
- provides a command <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\pgfpathcircle</span></span></span> that generates the necessary curve coordinates for you.
- <!--l. 74--><p class="noindent">The basic layer is consists of a <span
-class="cmti-10">core</span>, which consists of several interdependent packages that can only be
- loaded <span
-class="cmti-10">en bloc, </span>and additional packages that extend the core by more special-purpose commands like
- node management or a plotting interface. For instance, the <span
-class="cmcsc-10"><small
-class="small-caps">B</small><small
-class="small-caps">E</small><small
-class="small-caps">A</small><small
-class="small-caps">M</small><small
-class="small-caps">E</small><small
-class="small-caps">R</small> </span>package uses the core, but not all
- of the additional packages of the basic layer.
- </dd><dt class="description">
-<span
-class="cmbx-10">Frontend layer:</span> </dt><dd
-class="description">A frontend (of which there can be several) is a set of commands or a special syntax that makes
- using the basic layer easier. A problem with directly using the basic layer is that code written for this layer is
- often too &#8220;verbose.&#8221; For example, to draw a simple triangle, you may need as many as five commands when
- using the basic layer: One for beginning a path at the first corner of the triangle, one for extending the path to
- the second corner, one for going to the third, one for closing the path, and one for actually painting the
- triangle (as opposed to filling it). With the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">tikz</span></span></span> frontend all this boils down to a single simple <span
-class="cmcsc-10"><small
-class="small-caps">M</small><small
-class="small-caps">E</small><small
-class="small-caps">T</small><small
-class="small-caps">A</small><small
-class="small-caps">F</small><small
-class="small-caps">O</small><small
-class="small-caps">N</small><small
-class="small-caps">T</small></span>-like
- command:
-
-
- <table width="100%"
-class="verbatim"><tr class="verbatim"><td
-class="verbatim"><div class="verbatim">
- \draw&nbsp;(0,0)&nbsp;--&nbsp;(1,0)&nbsp;--&nbsp;(1,1)&nbsp;--&nbsp;cycle;
-</div>
- </td></tr></table>
- <!--l. 94--><p class="nopar">
- <!--l. 96--><p class="noindent">There are different frontends:
- <ul class="itemize1">
- <li class="itemize">The Ti<span
-class="cmti-10">k</span>Z&nbsp;frontend is the &#8220;natural&#8221; frontend for <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>. It gives you access to all features of <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>,
- but it is intended to be easy to use. The syntax is a mixture of <span
-class="cmcsc-10"><small
-class="small-caps">M</small><small
-class="small-caps">E</small><small
-class="small-caps">T</small><small
-class="small-caps">A</small><small
-class="small-caps">F</small><small
-class="small-caps">O</small><small
-class="small-caps">N</small><small
-class="small-caps">T</small> </span>and <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">S</small><small
-class="small-caps">T</small><small
-class="small-caps">R</small><small
-class="small-caps">I</small><small
-class="small-caps">C</small><small
-class="small-caps">K</small><small
-class="small-caps">S</small> </span>and
- some ideas of myself. This frontend is <span
-class="cmti-10">neither </span>a complete <span
-class="cmcsc-10"><small
-class="small-caps">M</small><small
-class="small-caps">E</small><small
-class="small-caps">T</small><small
-class="small-caps">A</small><small
-class="small-caps">F</small><small
-class="small-caps">O</small><small
-class="small-caps">N</small><small
-class="small-caps">T</small> </span>compatibility layer nor a
- <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">S</small><small
-class="small-caps">T</small><small
-class="small-caps">R</small><small
-class="small-caps">I</small><small
-class="small-caps">C</small><small
-class="small-caps">K</small><small
-class="small-caps">S</small> </span>compatibility layer and it is not intended to become either.
- </li>
- <li class="itemize">The <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgfpict2e</span></span></span> frontend reimplements the standard <span class="LATEX">L<span class="A">A</span><span class="TEX">T<span
-class="E">E</span>X</span></span>&nbsp;<span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{picture}</span></span></span> environment and
- commands like <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\line</span></span></span> or <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">\vector</span></span></span> using the <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;basic layer. This layer is not really &#8220;necessary&#8221;
- since the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pict2e.sty</span></span></span> package does at least as good a job at reimplementing the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{picture}</span></span></span>
- environment. Rather, the idea behind this package is to have a simple demonstration of how a
- frontend can be implemented.</li></ul>
- <!--l. 116--><p class="noindent">It would be possible to implement a <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgftricks</span></span></span> frontend that maps <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">S</small><small
-class="small-caps">T</small><small
-class="small-caps">R</small><small
-class="small-caps">I</small><small
-class="small-caps">C</small><small
-class="small-caps">K</small><small
-class="small-caps">S</small> </span>commands to <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;commands.
- However, I have not done this and even if fully implemented, many things that work in <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">S</small><small
-class="small-caps">T</small><small
-class="small-caps">R</small><small
-class="small-caps">I</small><small
-class="small-caps">C</small><small
-class="small-caps">K</small><small
-class="small-caps">S</small></span>&nbsp;will not
- work, namely whenever some <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">S</small><small
-class="small-caps">T</small><small
-class="small-caps">R</small><small
-class="small-caps">I</small><small
-class="small-caps">C</small><small
-class="small-caps">K</small><small
-class="small-caps">S</small></span>&nbsp;command relies too heavily on PostScript trickery. Nevertheless, such
- a package might be useful in some situations.</dd></dl>
-<!--l. 124--><p class="indent"> As a user of <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;you will use the commands of a frontend plus perhaps some commands of the basic layer.
-For this reason, this manual explains the frontends first, then the basic layer, and finally the system
-layer.
-<!--l. 131--><p class="noindent">
- <h4 class="subsectionHead"><span class="titlemark">1.2 </span> <a
- id="x2-50001.2"></a>Comparison with Other Graphics Packages</h4>
-<!--l. 133--><p class="noindent">There were two main motivations for creating <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>:
- <ol type="1" class="enumerate1" >
- <li class="enumerate" value="1"
-><a
- id="x2-5002x1"></a>The standard <span class="LATEX">L<span class="A">A</span><span class="TEX">T<span
-class="E">E</span>X</span></span>&nbsp;<span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{picture}</span></span></span> environment is not powerful enough to create anything but really
- simple graphics. This is certainly not due to a lack of knowledge or imagination on the part of <span class="LATEX">L<span class="A">A</span><span class="TEX">T<span
-class="E">E</span>X</span></span>&#8217;s
- designer(s). Rather, this is the price paid for the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{picture}</span></span></span> environment&#8217;s portability: It works together
- with all backend drivers.
- </li>
- <li class="enumerate" value="2"
-><a
- id="x2-5004x2"></a>The <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{pstricks}</span></span></span> package is certainly powerful enough to create any conceivable kind of graphic, but it
- is not portable at all. Most importantly, it does not work with <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pdftex</span></span></span> nor with any other driver that
- produces anything but PostScript code.</li></ol>
-<!--l. 149--><p class="indent"> The <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;package is a trade-off between portability and expressive power. It is not as portable as <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{picture}</span></span></span> and
-perhaps not quite as powerful as <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{pspicture}</span></span></span>. However, it is more powerful than <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{picture}</span></span></span> and more portable
-than <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">{pspicture}</span></span></span>.
-<!--l. 154--><p class="noindent">
- <h4 class="subsectionHead"><span class="titlemark">1.3 </span> <a
- id="x2-60001.3"></a>Utilities: Page Management</h4>
-<!--l. 156--><p class="noindent">The <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;package include a special subpackage called <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgfpages</span></span></span>, which is used to assemble several pages into a single
-page. This package is not really about creating graphics, but it is part of <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;nevertheless, mostly because its
-implementation uses <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;heavily.
-
-
-<!--l. 161--><p class="indent"> The subpackage <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgfpages</span></span></span> provides commands for assembling several &#8220;virtual pages&#8221; into a single &#8220;physical
-page.&#8221; The idea is that whenever <span class="TEX">T<span
-class="E">E</span>X</span>&nbsp;has a page ready for &#8220;shipout,&#8221; <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgfpages</span></span></span> interrupts this shipout and
-instead stores the page to be shipped out in a special box. When enough &#8220;virtual pages&#8221; have been accumulated in
-this way, they are scaled down and arranged on a &#8220;physical page,&#8221; which then <span
-class="cmti-10">really </span>shipped out. This mechanism
-allows you to create &#8220;two page on one page&#8221; versions of a document directly inside <span class="LATEX">L<span class="A">A</span><span class="TEX">T<span
-class="E">E</span>X</span></span>&nbsp;without the use of any
-external programs.
-<!--l. 171--><p class="indent"> However, <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgfpages</span></span></span> can do quite a lot more than that. You can use it to put logos and watermark on pages, print
-up to 16 pages on one page, add borders to pages, and more.
-<!--l. 178--><p class="noindent">
- <h4 class="subsectionHead"><span class="titlemark">1.4 </span> <a
- id="x2-70001.4"></a>How to Read This Manual</h4>
-<!--l. 180--><p class="noindent">This manual describes both the design of the <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;system and its usage. The organization is very roughly according
-to &#8220;user-friendliness.&#8221; The commands and subpackages that are easiest and most frequently used are described first,
-more low-level and esoteric features are discussed later.
-<!--l. 186--><p class="indent"> If you have not yet installed <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>, please read the installation first. Second, it might be a good idea to read the
-tutorial. Finally, you might wish to skim through the description of Ti<span
-class="cmti-10">k</span>Z. Typically, you will not need to read the
-sections on the basic layer. You will only need to read the part on the system layer if you intend to write your own
-frontend or if you wish to port <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;to a new driver.
-<!--l. 193--><p class="indent"> The &#8220;public&#8221; commands and environments provided by the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">pgf</span></span></span> package are described throughout the text. In
-each such description, the described command, environment or option is printed in red. Text shown in green is
-optional and can be left out.
-<!--l. 200--><p class="noindent">
- <h4 class="subsectionHead"><span class="titlemark">1.5 </span> <a
- id="x2-80001.5"></a>Getting Help</h4>
-<!--l. 202--><p class="noindent">When you need help with <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;and Ti<span
-class="cmti-10">k</span>Z, please do the following:
-<!--l. 205--><p class="indent">
- <ol type="1" class="enumerate1" >
- <li class="enumerate" value="1"
-><a
- id="x2-8002x1"></a>Read the manual, at least the part that has to do with your problem.
- </li>
- <li class="enumerate" value="2"
-><a
- id="x2-8004x2"></a>If that does not solve the problem, try having a look at the sourceforge development page for <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;and
- Ti<span
-class="cmti-10">k</span>Z&nbsp;(see the title of this document). Perhaps someone has already reported a similar problem and
- someone has found a solution.
- </li>
- <li class="enumerate" value="3"
-><a
- id="x2-8006x3"></a>On the website you will find numerous forums for getting help. There, you can write to help forums,
- file bug reports, join mailing lists, and so on.
- </li>
- <li class="enumerate" value="4"
-><a
- id="x2-8008x4"></a>Before you file a bug report, especially a bug report concerning the installation, make sure that this
- is really a bug. In particular, have a look at the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.log</span></span></span> file that results when you <span class="TEX">T<span
-class="E">E</span>X</span>&nbsp;your files. This
- <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.log</span></span></span> file should show that all the right files are loaded from the right directories. Nearly all installation
- problems can be resolved by looking at the <span class="obeylines-h"><span class="verb"><span
-class="cmtt-10">.log</span></span></span> file.
- </li>
- <li class="enumerate" value="5"
-><a
- id="x2-8010x5"></a><span
-class="cmti-10">As a last resort </span>you can try to email me (the author). I do not mind getting emails, I simply get
- way too many of them. Because of this, I cannot guarantee that your emails will be answered timely
- or even at all. Your chances that your problem will be fixed are somewhat higher if you mail to the
- <span
-class="cmcsc-10"><small
-class="small-caps">P</small><small
-class="small-caps">G</small><small
-class="small-caps">F</small></span>&nbsp;mailing list (naturally, I read this list and answer questions when I have the time).
- </li>
- <li class="enumerate" value="6"
-><a
- id="x2-8012x6"></a>Please, do not phone me in my office. If you need a hotline, buy a commercial product.</li></ol>
-
-
-
-
-
-
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-href="pgfmanualse1.html" >front</a>] [<a
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