Relation between the median spectral slopes in the three different wavelength ranges described in Sect. 3 for craters on the surface of Ceres with their age (left) and size (right). The upper panel corresponds to S_VIS, the central panel to S_VNIR, and the lower panel to S_VNUV. The represented ages are from two models: the asteroid derived model (in blue) and the lunar derived model (in red). The medianslope value of the region outside the craters is represented with a horizontal black line. The dashed lines mark the 16th and 85th percentiles. Solid lines correspond to the least squares fit for each model.