Average NIRSpec spectra recorded at Titan’s disk center (black) compared with an average spectra recorded at the limb, with a field-of-view centered between 0.865 and 1.135 Titan radii from disk center (red). The limb selection is multiplied by a factor of 2.15 to facilitate comparison of relative absorption depths. The CO line-to-continuum ratios are similar in the two selections, while the 5.11-μm feature is about a factor of two weaker in the limb selection. As discussed in the text, this behavior suggests that this feature originates from the surface.