Built-in fonts of the v42 layout engine
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TeX Gyre Heros, Termes and Cursor (version as distributed on CTAN, fonts/tex-gyre/opentype),
unmodified, (c) GUST e-foundry, under the GUST Font License (LPPL 1.3c), see GUST-FONT-LICENSE.txt.

They are metric-compatible clones of the PDF Standard-14 fonts Helvetica, Times and Courier.
Without useTTF() fonts, v42 measures and rasterizes text with them, while the PDF itself refers to the
Standard-14 fonts (no embedding). Vertical metrics (ascent, descent, line gap) are taken from
PD4ML's own Standard-14 values, not from these files. See com.pd4ml.fonts.BuiltinFonts.
