Average accretion luminosity ⟨L_acc(lines)⟩ derived from emission lines as described in the text (upper panel) and the ⟨L_acc(lines)/L_⋆⟩ ratio (lower panel) in logarithmic scale as a function of effective temperature for the total sample. The objects with transitional discs are distinguished with crossed squares, while the sub-luminous objects are shown with open circles. The dashed lines in both panels mark the locus below which chromospheric emission is important in comparison with L_acc. The vertical error bars represent the standard deviation over the average. The weak accretors and RY Lup are labelled.