/usr/share/doc/axiom-doc/bitmaps/plusminus.xbm is in axiom-hypertex-data 20120501-8.
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 | #define notequal_width 16
#define notequal_height 16
static char notequal_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0xf8, 0x0f, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x00, 0x00,
0xf8, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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