Quantity ∂m/∂p in the (r⊥, r∥) plane for the fitted parameters p ∈ [α∥, α⊥, bLyα, bSiIII(1207)], where m is the baseline model of the Lyα auto-correlation function. The graphs show which pixels contribute the most to the constraints on the considered parameter. BAO parameters α∥ and α⊥ are constrained by the bins around the location of the BAO peak, while the Lyα bias is mostly constrained by the bins at approximately zero separation. We also note that the Si III(1207) bias is mostly constrained by the bins r⊥ ∼ 0, r∥ ∼ 21 h−1 Mpc, in agreement with the apparent separation given in Table 3.
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