Stellar mass versus luminosity of the lens sample. The colour coding represents the redshift of the galaxies as denoted in the lower right-hand corner. The histograms for all galaxies (black line), the early-types (red line) and the late-types (blue line), as a function of stellar mass and luminosity are also shown, and are drawn slightly offset for clarity. The dashed diagonal lines indicate the additional mass-to-light ratio cuts we have applied (objects with M_∗/L_r between 0.2 and 10 have been selected) to remove outliers that may contaminate the lensing signal.