Upper panel: variations of the predicted XLF with the change in the parameters Ω_m and σ₈. The reference model (solid red line) has Ω_m = 0.26 and σ₈ = 0.8, the dashed line has Ω_m = 0.30 and the dot-dashed line Ω_m = 0.22, while the upper dotted line shows the result for σ₈ = 0.9 and the lower one for σ₈ = 0.7. Lower panel: Variations of the predicted XLF with the change in the parameter, α_sl of the L_X − M scaling relation. The reference model (solid red line) has α_sl = 1.51, the two dashed lines correspond to α_sl = 1.61 and 1.71 and the two dotted lines to α_sl = 1.41 and 1.31.