FUV (dashed lines) and NUV (solid lines) modeled surface brightness (green line) plotted against the IR 100 μm surface brightness with the observed background (black line) and the offset (red line) for the SGP. The blue line shows the models with the offsets of 234 photon units in the FUV and 538 photon units in the NUV. The FUV model is for a = 0.4 and g = 0.6 and the NUV model for a = 0.4 and g = 0.5.