/usr/share/xemacs-21.4.22/etc/gray1.xbm is in xemacs21-support 21.4.22-14ubuntu1.
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 bg2_width 16
#define bg2_height 16
static char bg2_bits[] = {
0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00,
0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00,
0x55, 0x55, 0x00, 0x00, 0x55, 0x55, 0x00, 0x00};
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