Comparison of the relative spectral transmission at the CO transition frequency with the relative CO unit conversion coefficient (see Eq. (36)) for the 100 a), 217 b), and 353 c) GHz bands. Each plot shows a uniform normalization (diamonds) where each detector coefficient contributes to the mean equally, a weighted normalization (squares) where the normalization is detector noise weighted, and a reference line to demonstrate deviations of the data points from a perfect one-to-one correlation.