Optical spectra of the lensing galaxies of HE 0047−1756 (top panel) and HE 0435−1223 (bottom panel) at respective redshifts of z = 0.408 ± 0.001 and z = 0.454 ± 0.001 from Eigenbrod et al. (2006). The corresponding 1σ error spectrum of each galaxy is shown in cyan above the zero flux line (dotted line). The galaxy spectra are dominated by prominent absorption lines such as Ca ii H&K, G-band, and Mg b as by dashed lines. Night-sky absorption bands and emission line residuals are also marked by an earth symbol.