#define sigma_width 16
#define sigma_height 16
#define sigma_x_hot -1
#define sigma_y_hot -1
static char sigma_bits[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x1f, 0xf8, 0x1f, 0x9c, 0x03,
   0x0e, 0x03, 0x06, 0x03, 0x06, 0x03, 0x06, 0x03, 0xce, 0x01, 0xfc, 0x00,
   0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};