(Top) The original data (gray) were scaled to the NEATM model (black) calculated with a constant η of 0.89. (Bottom) The adjusted data (red) differ in overall emissivity by 13% and have a redder slope between 22 and 28 μm (cyan line) than the original emissivity spectrum (dark gray line). The 22 μm feature is marked with a black arrow in the plot of F216.