Comment # 20 on bug 979566 from Stefan Dirsch

At the time our i18n expert tried to switch the default font for xterm to a
pixel size of 18 (since this font has the best support for glyphs of any
language) he failed, since it was not acceptable for another collegue (who
didn't care about i18n support). He insisted on having a pixel size of 13 (at
that time; he might have changed his habits meanwhile). So the compromise was
to use that best font with that aspect for uxterm, which the collegue doesn't
use.
So we still have

xterm -> 13 pixel
uxterm -> 18 pixel