This file is indexed.

/usr/share/themes/Numix/openbox-3/max.xbm is in numix-gtk-theme 2.6.7-3.

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#define max_width 8
#define max_height 8
static unsigned char max_bits[] = {
   0xff, 0xff, 0xc3, 0xc3, 0xc3, 0xc3, 0xff, 0xff };