Evolution of EFIGI attributes related to disk galaxies. Left: mean values of the EFIGI Arm Curvature attribute for all EFIGI ∩ GALEX galaxies with Incl-Elong ≤ 2, in color-mass cells of 0.75 dex in stellar mass and 0.75 in NUV−r color all the way from the Blue Cloud to the Red Sequence. Arm Curvature describes the intrinsic curvature of the spiral arms, when they are visible (hence the smaller samples compared to the central and right panels). It increases from late-type to earlier type spirals, in agreement with the definition of these types in the Hubble-de Vaucouleurs sequence. Center: same as the left panel but for the mean values of the EFIGI Arm Strength attribute, which describes the strength of the spiral arms in terms of flux fraction relative to the whole galaxy. Right: same as the left panel but for the mean values of the EFIGI Flocculence attribute, which measures the relative importance of flocculent features, due to scattered HII regions. The joint fading of Flocculence and Arm Strength across the Green Plain hints at a restriction in neutral gas supply.