Parameter distribution and photometric indicators for effective temperatures. Left: distribution of T_eff for the training sample composed of 4299 stars from J-PLUS × SEGUE. Right: relative importance of the features for the estimation of effective temperature. The most important features as T_eff indicators are the colors g-i, g-z, and the color J05150−J0861 based on the narrow-band filters that contain the Mg I Triplet and the Ca II Triplet.