Variations of the relative number of accurate estimations as a function of the column density and excitation temperature. The contour corresponds to the frontier where the relative precision on the actual values of the four parameters is ρ = 20% (solid red contour on the left) and 10% (dashed red contour on the right). 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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