Depth of absorption as a function of J″ for the ¹²C¹⁶O 1–0 lines in the 2020 August in-eclipse spectrum measured at 5 km s⁻¹ velocity steps across the line profile (see symbol key on figure). The lines used are R3, R8, the average of P22, 27, and 33 plotted at J″ = 27, and P38. The line profiles are shown in Figure 5, panels (a) and (b). The measurements at the same velocity for different J″ are connected by solid lines.