Soft-band cumulative number counts in different redshift ranges. Left panel: soft-band log Nlog S in the Spiderweb field (within a radius of 5 arcmin) after excluding the X-ray sources identified in the 2.11 < z < 2.20 range compared to the expectations from the model of Gilli et al. (2007) in the same redshift range. The shaded area corresponds to an uncertainty of 1σ. Right panel: soft-band log Nlog S in the Spiderweb field only for the redshift interval 2.11 < z < 2.20 compared to the expectations from the model of Gilli et al. (2007) in the same redshift range. The shaded area corresponds to an uncertainty of 1σ. We note the different scales between the two panels.