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/usr/share/xcrysden/images/underline.xbm is in xcrysden-data 1.5.60-1build3.

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#define underline_width 16
#define underline_height 16
static unsigned char underline_bits[] = {
   0x00, 0x00, 0x3c, 0x3c, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
   0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x30, 0x0c, 0xf0, 0x0f, 0xe0, 0x07,
   0x00, 0x00, 0xfc, 0x3f, 0xfc, 0x3f, 0x00, 0x00};