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This package, initially based on txfonts, provides many fixes and enhancements to the txfonts package, splitting it into two separate packages---newtxtext and newtxmath, which may be run independently of one another. It provides scaling, improved metrics, and other options. In particular, newtxmath offers a libertine option which substitutes Linux Libertine (provided with TeXLive and MikTeX) italic and Greek letters for the default Times letters, providing a good match for the Libertine text font, which is heavier than Computer Modern but lighter than Times, and in my experience, looks very sharp and clear on the screen.
-Current version: 1.601 2019-10-02
+Current version: 1.603 2019-10-10
This material is subject to the LaTeX Project Public License. See http://www.ctan.org/license/lppl1.3
for the details of that license.
+Changes in version 1.603
+1. Corrected the sups lookup in the otf fonts to include 1,2,3.
+2. Added ae.superior to the otf fonts.
+3. Adjusted some figure shapes to blend better with {1,2,3}.superior (otf only, so far.)
+
+Changes in version 1.602
+1. Newtxmath.sty no longer requires the trimspaces package.
+2. Corrected newtx.map so that the ntxsups encoding names are now all in lowercase, matching the actual filenames.
+3. Added the changes needed for stix2 option to work as an enhanced option, able to generate conformant PDF/A-1b pdf output.
+
Changes in version 1.601
1. 1. Changed name of file newtx.subs to newtx-subs.tex, with similar changes for other such files.
2. Placed the \pdfglyphtounicode lines in a conditional block in newpxmath.sty so it could continue to be used with other engines. (Thanks Hironobu Yamashita.)