Kernel-density estimates of the uncertainty distributions for the distances (left panel) and A_V extinctions (right panel) in the APOGEE DR16 StarHorse VAC. The different curves show the distributions of distances and extinctions uncertainties for subsets of different data input quality. Left panel: we highlight the higher distance precision achieved for a stars with Gaia DR2 parallaxes more precise than 20%, b dwarf stars (log g <  4), and c red-clump stars (2.3 <  log g <  2.5). In the right panel, we show how the (un-)availability of optical photometry drastically improves or worsens the precision of our A_V estimates.