Variation in the best fitting parameters for Ω_m and σ₈ with a change in slope, scatter, and normalization of the L_X − M scaling relation. The end- and mid-points of the bars give the results for the following values: slope =1.435, 1.51, 1.586 (±5%, largest bars), normalization =0.1292, 0.1175, 0.1058 (±10%, bars in direction of minor axis), scatter =27%, 30%, 33% (± 10%, smallest bars).