Band-pass corrections derived from two red galaxy templates (dotted dashed red lines) from Greisel et al. (2013). These templates are adopted as standard reference SED for the LRG sample used to derive the scaling factors p_LRG that convert the Planck radiance map to reddening values (see Sect. 3.4). The first is used to calibrate the z = [0.15−0.25] sample, the second to calibrate both the z = [0.25−0.3] and z = [0.3−0.35] samples. The p_LRG obtained for the three samples are shown by the black dots with the plotted values corresponding to bpc_LRG = p_B5/p_LRG where the optimal p_B5 is found to be equal to 5.54 × 10⁵ m² sr W^-1. The median band-pass correction bpc_P14 = 1.018 (see Fig. 4) is also plotted in blue for reference.