/usr/lib/aspell/tex.amf is in libaspell15 0.60.7~20110707-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | MODE tex
ASPELL >=0.60
MAGIC /0:256:^[ \t]*\\documentclass\[[^\[\]]*\]\{[^\{\}]*\}/tex
DESCRIPTION mode for checking TeX/LaTeX documents
FILTER url
FILTER tex
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