Cross-calibration with the tracers, X_CI × α_CO (left) and X_CI × α_[CII] (right), δ_GDR/α_CO (left) and δ_GDR/α_[CII] (right), and X_CI × α_CO (left) and α_CO/α_[CII] (right), are compared against the simulation described in Sect. D in the first, second, and third row, respectively. The resulting data, including the measurement uncertainty is represented as the blue solid line (binned the same as the original data), and the red dotted line.