Measured EBL spectrum. Obtained levels are represented by the red points. Horizontal lines represent the bandwidth over which the integrated EBL levels apply. The vertical solid lines represent the 1-σ (statistical) errors from Eq. (12). The dashed lines represent the systematic uncertainties on fitted EBL levels conservatively estimated as explained in the text. Direct constraints on the EBL collected from Dwek & Krennrich (2013) and Biteau & Williams (2015) are shown; lower and upper limits are represented by green and brown arrows, respectively.