Effective gravity as a function of radius for our density profile and Atwood number determined from the flame data in Timmes & Woosley (1992). The gray vertical line marks the location of ignition for our model A runs. For radii less than about 300 km, g _eff∝ r ^0.92; for larger radii, the decrease in density overcomes the increase in Atwood number, and g _eff plummets.