E(BP−RP) vs. EW₈₆₂ of the DIB λ862 derived for the HQ sample by GSP-Spec for hot stars. The colour code follows the effective temperature derived by ESP-HS or GSP-Spec. The running median and interquantile (15–85%) are represented by a black step curve and the shaded area, respectively. The relation derived for the cooler stars is shown by the broken blue line. Upper panel: reddening derived using the ESP-HS module for stars hotter than 7500 K. The outliers are identified with black circles and numbers. Middle panel: E(BP−RP) from GSP-Phot for targets hotter than 7000 K according to GSP-Spec only. Lower panel: E(BP−RP) from GSP-Phot, and hotter than 7000 K according GSP-Spec and GSP-Phot. Numbered black circles denote the outliers which are discussed in the main text, with their parameters listed in Table C.1.