This file is indexed.

/usr/include/X11/bitmaps/gray3 is in xbitmaps 1.1.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#define gray3_width 4
#define gray3_height 4
static char gray3_bits[] = {
   0x01, 0x00, 0x04, 0x00};