Sensitivity tests on (Ω_m,σ₈). The four plots indicate different variation directions in the Ω_m-σ₈ plane. The upper left, upper right, lower left, and lower right panels: variation in Ω_m, σ₈, diagonal, and anti-diagonal direction, respectively. Blue solid lines represent full N-body runs, while red squares are always our model with N-body input. The field of view is 859 deg². The N-body data is only indicative.