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Fig. 3

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Comparison of the RzRi parameter and of the spectral slope for the sub-sample of 14 129 asteroids observed both by Gaia and SDSS. We note that the slope distribution (panel A) of Gaia has a wing that extends to redder slopes than the SDSS. Panel B shows that the distributions of RzRi for Gaia and SDSS are clearly shifted, with Gaia seeing a less deep Band I compared to the SDSS. Gaia and SDSS RzRi parameter histograms can be superimposed when a constant value of 0.07 is subtracted from Gaia RzRi-values.

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