This file is indexed.

/usr/include/X11/bitmaps/1x1 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.

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#define 1x1_width 16
#define 1x1_height 16
static char 1x1_bits[] = {
   0xff, 0xff, 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff, 0x55, 0x55,
   0xff, 0xff, 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff, 0x55, 0x55,
   0xff, 0xff, 0x55, 0x55, 0xff, 0xff, 0x55, 0x55};