This file is indexed.

/usr/include/X11/bitmaps/grid16 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 grid16_width 16
#define grid16_height 16
static char grid16_bits[] = {
   0x55, 0x55, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
   0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
   0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00};