Demonstration of how Lyα break and emission for a source at z = 7 are affected by the low resolving power of our observations. The top panel shows how a step function (blue line) is affected by the resolving power on a high-resolution (Δλ = 0.001 μm) spectral grid (orange curve), and how this curve would appear on the R100 spectral grid (green steps). If we add Lyα emission with a given REW_Lyα in the first high-resolution spectral bin redwards of the break and then account for the LSF and R100 spectral bin, we find the curves in the lower panel.