/usr/share/tcltk/tcl8.5/Tix8.4.3/bitmaps/ck_on.xbm is in tix 8.4.3-5.
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 ck_on_width 13
#define ck_on_height 13
static unsigned char ck_on_bits[] = {
0xff, 0x1f, 0x01, 0x10, 0x01, 0x10, 0x01, 0x14, 0x01, 0x16, 0x01, 0x17,
0x89, 0x13, 0xdd, 0x11, 0xf9, 0x10, 0x71, 0x10, 0x21, 0x10, 0x01, 0x10,
0xff, 0x1f};
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