Left: average Log () in bins of Log (L_X) in five redshift bins. The short dashed line is the correlation derived in Mullaney et al. (2011) for a pure AGN SED. Right: average Log (L_X) in bins of Log (). The long dashed line represents a constant SFR/BHAR of 500, from C13. In both panels the vertical error bars are computed through a bootstrap resampling procedure, while the horizontal error bars show the 1σ dispersion of that bin.