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 NGP. The blue line shows the models with the offsets of 233 photon units in the FUV and 485 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.