/etc/angband/pref/font-x11.prf is in angband 1:3.5.1-2.2.
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 11 12 | # File: font-x11.prf
# Terrain features
# open floor
F:1:all:0x01:0x1F
# invisible trap
F:2:all:0x01:0x1F
# magma vein with treasure
F:54:all:0x03:0x01
# quartz vein with treasure
F:55:all:0x03:0x01
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