Comparison between the observed ALHAMBRA mass-to-light ratio and the expected ratio from our median relation as a function of redshift for quiescent (top panel) and star-forming (bottom panel) galaxies with F814W ≤ 23 (grey dots). The solid contours show levels in the number of galaxies, starting at one galaxy and increasing in steps of five galaxies for quiescent galaxies, and in steps of 15 galaxies for star-forming galaxies. The dashed lines mark null difference. The solid lines show the linear fit to the mass-to-light ratio residuals, ΔΥ_Q ∝ 0.04z (top panel) and ΔΥ_SF ∝ 0.01z (bottom panel).