Full path :

/usr/local/share/afterstep/desktop/cursors/resize_h.xbm.mask

#define resize_h_width 16
#define resize_h_height 16
static unsigned char resize_h_bits[] = {
   0x00, 0x00, 0x00, 0x00, 0x20, 0x04, 0x30, 0x0c, 0x38, 0x1c, 0xfc, 0x3f,
   0xfe, 0x7f, 0xff, 0xff, 0xfe, 0x7f, 0xfc, 0x3f, 0x38, 0x1c, 0x30, 0x0c,
   0x20, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};