PC1 versus PC2 plot of main-belt asteroid reflectance spectra from the Gaia DR3 with S/N>50 (blue circles; see Gaia Collaboration 2023 for details of the S/N estimation). The red stars indicate the A types that we selected from the literature following the method explained in the text and that also have a DR3 reflectance spectrum. The green triangles show the asteroids that we observed with the IRTF.