The mean (a) and width (b) of the distribution of reconstructed photon multiplicity ($N_{\gamma\text-\rm like}$) as a function of true photon multiplicity ($N_{\gamma\text-\rm true}$) are presented for \pPb collisions at \fivenn. The dotted lines correspond to $N_{\gamma\text-\rm true}$ = 140 up to which the results are reported in the paper.