/usr/lib64/tcl8.6/Tix8.4.3/bitmaps
Edit: /usr/lib64/tcl8.6/Tix8.4.3/bitmaps/minus.xbm (198B)
#define minus_width 9
#define minus_height 9
static unsigned char minus_bits[] = {
0xff, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7d, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0xff, 0x01};