DR diagram in which different DR regimes are expected: anti-solar, solar-type, and quenched or cylindrical (see Fig. 1). Gray regions represent transition regions between DR regimes. Top: dotted lines represent constant Ro_f/Ro_f, ⊙ as a function of T_eff and P_rot as deduced from Eq. (18). The solid black line represents the value Ro_f/Ro_f, ⊙ = 1. Bottom: zoom into the top panel around the anti-solar DR candidates, color-coded by metallicity.