Characteristics of the anticentre AC20 sky. Panel a: number of sources and the rest of panels show median quantities for bins of 0.1 deg of the magnitude (b), colour (c), extinction inthe G band (d, only for stars with ϖ∕σ_ϖ > 3, see Sect. 2.4), visibility_periods_used (e), parallax (f), uncertainty in the proper motion in the δ direction (g), and zero point correction to the parallax ZP₅₆ (h, see Sect. 3.1).