Effective temperature difference between values obtained by ESP-HS and those from literature catalogues as a function of the literature T_eff. We indicate the running median with the solid orange lines and the interquantile dispersions by the shaded orange regions. The blue numbers in each panel indicate the number of stars that is compared. We emphasise that the scales on the x- and y-axes are scaled by 1000 and 100 K, respectively. Reference estimates are from the LAMOST (DR5) A-type stars (LAMOST A (DR5v3), Luo et al. 2019), derived from Stromgren photometry (Stromgren A and Stromgren B) by adopting the updated calibration of Napiwotzki et al. (1993), from the Pastel catalogue (PASTEL; Soubiran et al. 2016), from the LAMOST OBA (DR6) catalogue (HotPayne LAMOST DR6; Xiang et al. 2022), and from the Gaia ESO survey (GES; Blomme et al. 2022).