Fig. C.2


Variations of the bias (left) and efficiency (right) of the maximum likelihood estimator as a function of the column density and excitation temperature. The solid and dashed red contours correspondto the frontiers where the relative precisions on the estimations on the four parameters are ρ = 20, and 10%, respectively, as defined in Fig. C.1. The 13CO(1−0) and 13CO(2− 1) lines are simulated with σb = 100 mK, ΔV = 1.1 km s−1, and σV = 0.61 km s−1.

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