Separation power ($S_{\pi-e}$) of pions and electrons (minimum ionizing particles, \ie pions at 0.3 to 0.6 GeV/$c$ versus electrons from gamma conversions at 0.35 to 0.5 GeV/$c$) as a function of the track momentum dip angle, where $\tan\mathrm{\lambda} = p_{\mathrm{z}}/p_{\mathrm{T}}$ Comparison of d$E$/d$x$ separation power using total cluster charges from Offline CF and different versions of the HWCF