STYLES[TABLE_VERT][0]: style of line from left of BB to its center.
STYLES[TABLE_VERT][1]: style of line from right of BB to its center. */
void (*draw_line) (void *aux, int bb[TABLE_N_AXES][2],
STYLES[TABLE_VERT][0]: style of line from left of BB to its center.
STYLES[TABLE_VERT][1]: style of line from right of BB to its center. */
void (*draw_line) (void *aux, int bb[TABLE_N_AXES][2],