Percentage of LMXB contribution as a function of the SFR (top panel) and the sSFR (bottom panel), respectively. The grey stars represent the individual galaxies with reliable flux measurements and the squares the reliable stacks. The colour-code indicates the logarithm of the number of galaxies that participate in each SFR-M_⋆-D stack. The error bars were calculated assuming the lower and upper 68% C.I. of the X-ray luminosity distribution.