/usr/share/doc/axiom-doc/bitmaps/xgreybox.bitmap is in axiom-hypertex-data 20140801-11.
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 Xgreybox_width 16
#define Xgreybox_height 16
static char Xgreybox_bits[] = {
0x00, 0x00, 0x00, 0x00, 0xfc, 0x3f, 0xfc, 0x3f, 0xac, 0x3a, 0x5c, 0x35,
0xac, 0x3a, 0x5c, 0x35, 0xac, 0x3a, 0x5c, 0x35, 0xac, 0x3a, 0x5c, 0x35,
0xfc, 0x3f, 0xfc, 0x3f, 0x00, 0x00, 0x00, 0x00};
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