Histograms of the number of observations on each band, per survey. Each band is identified by a color and a hatch style. Gaia filters G_BP and G_RP are identified with blue solid and orange hatched bars, respectively. Pan-STARRS1 bands are identified with solid green for ɡ, red right diagonal hatch for r, purple horizontal hatch for i, brown left diagonal hatch for z, and pink dotted bar for y. Both Gaia and ZTF are balanced but differ in the number of observations per light curve by one order of magnitude. Pan-STARRS1 is not balanced, showing longer sequences on the i band. As such, not all the bands will be available for some objects.