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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: 1.71 2022-03-02
+Current version: 1.72 2023-07-26
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 1.72
+1. Modified the math glyphs involving "precede" and "follow" in order to distinguish them more easily from those involving "less" and "greater" (regular weight only.) Dependence on txsya and txsyb was dropped in favor of a new txsym which combines the two along with modifies "precede" and "follow" glyphs. In addition, ntxsys and ntxsyc were modified, as was newtx.map.
+2. Added horizontal kerning data for letter pairs commonly used in Central European languages such as Polish and Czech. (Luatex and Xetex only.)
+3. The nofontspec option to newtx and newtxtext no longer has any effect as xelatex and lualatex cannot handle text fonts except in TU encoding. Newtx and newtxtext will take no action if the nofontspec is specified. The same goes for the type1 and type1text options.
+4. Added support files for subscripts in type1 libertine and libertinus and extended \textfrac macro to those fonts when run from newtx.sty.
+5. Fixed the unwanted ij and IJ ligatures in the T1 encoded ntx tfm files. I learned that an entry like % ligkern i {} j ; in the encoding file does not override a ligature specification in the afm file when using afm2tfm.
+6. Replaced all occurrences of npxdnom_{ot1,t1,ly1}.enc in newtx.map by npxdnom_{OT1,T1,LY1}.enc so as to match the capitalizations in newpx.map.
+
+
Changes in version 1.71
1. Updated newtx.sty so that most packages for which newtxmath offers math
support may be set up using options to newtx.