Left panel: Median soft X–ray surface brightness of the WARM and ICM phases and the ALL gas in the 0.2–0.4 keV band, approximately equivalent to the ROSAT R12 band of the B02 data. Right panel: Median soft X–ray surface brightness in the 0.2–1 keV band, corresponding to the B22 data. For each line, the shaded area represents the 20th to 80th percentiles within each cluster sample. The R12 band corresponds to approximately 0.2 − 0.4 keV, and the R34 band corresponds to ∼0.4 − 1.0 keV (Snowden et al. 1995, 1997).