Erratum: Disorder effects on the density of states of the II-VI semiconductor alloys ${\mathrm{Hg}}_{0.5}$${\mathrm{Cd}}_{0.5}$Te, ${\mathrm{Cd}}_{0.5}$${\mathrm{Zn}}_{0.5}$Te, and ${\mathrm{Hg}}_{0.5}$${\mathrm{Zn}}_{0.5}$Te