runtime/tcl/tix8.4.3/demos/bitmaps/underlin.xbm

#define underline_width 16
#define underline_height 16
static unsigned char underline_bits[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x1c, 0x38, 0x1c,
   0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x70, 0x0e,
   0xf0, 0x0f, 0xe0, 0x07, 0x00, 0x00, 0xf8, 0x1f};