Absolute magnitudes of the SNe Ia in the calibrator sample for the J-band (left) and H-band (right). The horizontal lines represent the weighted average and the strip the standard deviation around that value. In the left panel we included the nine SN Ia included in D18 for reference. Uncertainties correspond to those described in Sect. 3.5 and do not include the σ_int term added in quadrature.