/usr/share/doc/axiom-doc/bitmaps/gamma.bitmap is in axiom-hypertex-data 20170501-3.
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 gamma_width 16
#define gamma_height 16
static char gamma_bits[] = {
0x00,0x00,0x00,0x00,0x38,0x10,0x7c,0x18,0xc6,0x1c,0x86,0x0c,0x82,0x0c,0x82,
0x07,0x00,0x07,0x00,0x03,0x00,0x03,0x00,0x01,0x80,0x01,0x80,0x01,0x80,0x00,
0xc0,0x00};
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