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/usr/lib/blt2.5/treeview_m.xbm is in tk8.6-blt2.5 2.5.3+dfsg-1.

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#define testm_width 16
#define testm_height 16
#define testm_x_hot 7
#define testm_y_hot 7
static unsigned char testm_bits[] = {
   0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xfc, 0x3f, 0xfe, 0x7f,
   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x7f, 0xfc, 0x3f, 0xf0, 0x0f,
   0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f, 0xf0, 0x0f};