Fraction of disk‐dominated galaxies (those with ﹩B/ T< 0.4﹩) in the low‐﹩L_{\mathrm{X}\,}﹩ and high‐﹩L_{\mathrm{X}\,}﹩ samples as a function of the cluster X‐ray luminosities (open circles). Error bars on the data points are 1 σ bootstrap estimates and include the uncertainty in the background correction. The filled diamonds show the error‐weighted mean fractions for the combined low‐﹩L_{\mathrm{X}\,}﹩ and high‐﹩L_{\mathrm{X}\,}﹩ samples, with an error bar that represents the 1 σ standard deviation in this fraction from cluster to cluster (i.e., it is not the error on the mean). The solid line is the corresponding fraction in the field population, and the dashed lines show the 1 σ field‐to‐field standard deviation of this quantity.