/usr/lib/dvi2ps/fonts/ntt-ipa is in dvi2ps 5.1j-1.2+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # jstfm NTT JTeX with DNP font tfm
font jstfm * 0 $nsf/tfm/%f.tfm
map dm%j%d SSMR :[jis]${tt}ipam.ttf
map dg%j%d SSMR :[jis]${tt}ipag.ttf
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