/usr/include/X11/bitmaps/hlines3 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 hlines3_width 1
#define hlines3_height 3
static char hlines3_bits[] = {
0x00, 0x01, 0x00};
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