/usr/share/doc/axiom-doc/bitmaps/xtickbox.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 Xtickbox_width 16
#define Xtickbox_height 16
static char Xtickbox_bits[] = {
0x00, 0x00, 0x00, 0x00, 0xfc, 0xdf, 0xfc, 0xef, 0x0c, 0x70, 0x2c, 0x38,
0x6c, 0x1c, 0xec, 0x2e, 0xcc, 0x37, 0x8c, 0x33, 0x0c, 0x31, 0x0c, 0x30,
0xfc, 0x3f, 0xfc, 0x3f, 0x00, 0x00, 0x00, 0x00};
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