Comparison between the effective temperature derived from J-PLUS () and Gaia EDR3 () photometry. Top left panel: individual measurements (red dots) with gray error bars. The median in ten temperature intervals is marked with the white dots. Dashed line marks the one-to-one relation. Top right panel: relative difference between J-PLUS and Gaia temperatures as a function of Gaia temperature. White dots show the median difference in ten temperature intervals. Dashed line depicts identity. Bottom left panel: histogram of the relative difference. Bottom right panel: histogram of the error-normalised difference between J-PLUS and Gaia temperatures. In both bottom panels, the red line shows the best Gaussian fit to the distribution, with parameters labeled in the panel.