  We discuss polarization selection rules for angle-resolved photoemission
spectroscopy in Bi2212. Using these we show that the ``hump'' in the
superconducting gap observed in the $X$ quadrant in our earlier work is not on
the main $CuO_2$ band, but rather on an umklapp band arising from the
structural superlattice. The intrinsic gap is most likely quite small over a
range of $\pm 10^\circ$ about the diagonal directions.
