/usr/lib/swi-prolog/xpce/bitmaps/mark.bm is in swi-prolog-x 6.6.4-2ubuntu1.
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 mark.bm_width 16
#define mark.bm_height 16
static char mark.bm_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x00, 0x30, 0x00, 0x30,
0x00, 0x18, 0x00, 0x18, 0x01, 0x0c, 0xfb, 0x1f, 0x0e, 0x16, 0x18, 0x12,
0x38, 0x13, 0xe8, 0x11, 0x88, 0x11, 0xf8, 0x1f};
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