Magnitude of the red clump in K_s band estimated from our asteroseismic sample (circles, same colour scheme as in Fig. 1), and Gaia EDR3 samples before applying L21 corrections (filled triangles) and after (open triangles), as a function of the sine of the galactic latitude. The lines show predictions from modelling: purple and orange respectively for a metal-poor (−0.4 dex) and metal-rich model (+0.2 dex); dashed and dotted respectively for a young (5 Gyr) and old model (12 Gyr; see Fig. 8 in Girardi 2016). These values were chosen to be representative of the lower and upper bounds of the metallicity and age distributions in the asteroseismic fields.