Correlation between EW₈₆₂ and E(BP−RP) for 55 557 measurements in the high-quality sample with E(BP−RP) values. The colour scale shows the number of stars per 0.01 Å × 0.05 mag bin. The red dots are the median values taken in EW₈₆₂ bins from 0 to 0.6 Å with a step of 0.05 Å. The red line is the linear fit to the red dots. The fitting gradient and its uncertainty are also indicated. The open black circles (305 in total) are sources with a temperature difference (GSP-Phot – GSP-Spec) larger than 5000 K.