Recovered SEDs in comparison to UV background spectra from the literature for the metal line systems at z = 1.7529 (upper panel), z = 2.3799 (middle panel), and z = 2.8266 (lower panel). Thick blue lines display our fiducial spectra described by (Δ₁,Δ₂,Δ₃) = (+0.4, −0.5, +0.4) at z = 1.7529, (+0.4,0.0, −0.3) at z = 2.3799, and (+0.3, −0.6, −0.4) at z = 2.8266, compared to the unmodified Haardt & Madau (2001) background (thin black line; HM01), the sawtooth spectrum of Madau & Haardt (2009) in the Haardt & Madau (1996) uniform background limit (red dashed line; MH09/HM+S) and with delayed helium reionization boosting the He ii/H i by factors of 10, 30, and 500 compared to the MH09/HM+S case (thin solid lines; MH09/DR10, MH09/DR30, MH09/DR500), respectively, and the UV background spectrum of Faucher-Giguère et al. (2009, dotted line; FG09) at the appropriate redshifts. All spectra are normalized to log J =  −21.1 at 1 Ryd.