Cluster number counts as a function of redshift. The filled black circles show the candidate cluster counts from the flag  ≤ 3 objects in the D1 and D4 fields combined. Open circles show the counts based on the flag  ≤ 5 objects. The solid line shows the model predictions based on the WMAP 7-year cosmological parameters. The effect of the 1σ uncertainty in the scaling relations is illustrated by the dashed line, whilst the dash-dot line shows the effect of the 1σ uncertainty in the scaling relations, combined with a WMAP 7-yr model taking the 2σ uncertainty limits on Ω_m and σ₈.