The effect of steady sources in the ensemble of models. The blue line is the PDF for Cygnus field when the null hypothesis for Cygnus X-3 is true, and the red line is the PDF for an empty Galactic field when the null hypothesis is true, with the parameters T_ss = 4, t_lcl = 5.99147, when the flux and position of source in the alternative hypothesis are allowed to vary, but g_gal and g_iso parameters are fixed, ICL criterion. Black line is the best-fit function described in Eq. (5). The red dotted line is the theoretical distribution, the green dashed line is the theoretical distribution, the cyan dotted-dashed line is the distribution.