/usr/share/tcltk/tcl8.6/Tix8.4.3/bitmaps/tick.xbm is in tix 8.4.3-10.
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 tick_width 14
#define tick_height 14
static char tick_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x38, 0x00, 0x1c, 0x00, 0x0e,
0x00, 0x07, 0x80, 0x03, 0xc2, 0x01, 0xe7, 0x00, 0x7f, 0x00, 0x3e, 0x00,
0x1c, 0x00, 0x08, 0x00};
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