/usr/share/doc/axiom-doc/bitmaps/delta.xbm 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 7 | #define delta_width 15
#define delta_height 20
static char delta_bits[] = {
0x00, 0x0e, 0x00, 0x13, 0x80, 0x01, 0x80, 0x01, 0x00, 0x03, 0x00, 0x07,
0x80, 0x06, 0x40, 0x0c, 0x40, 0x0c, 0x60, 0x0c, 0x60, 0x0c, 0x60, 0x0c,
0x60, 0x04, 0xc0, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00};
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