/usr/lib/grass64/bwidget/images/plus.xbm is in grass-gui 6.4.3-3.
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 | #define plus_width 9
#define plus_height 9
static char plus_bits[] = {
0xff,0x01,0x01,0x01,0x11,0x01,0x11,0x01,0x7d,0x01,0x11,0x01,0x11,0x01,0x01,
0x01,0xff,0x01};
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