/usr/include/X11/bitmaps/gray1 is in xbitmaps 1.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #define gray1_width 2
#define gray1_height 2
static char gray1_bits[] = {
0x01, 0x02};
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