Fig. 6


Noise standard deviation σb,ρ in mK whichensures that relative precisions are better than ρ% (for details see Eq. (25)). Top: analysis of a single line. Bottom: analysis of two lines 13CO(1− 0) and 13CO(2− 1). The contours for 10 and 100 mK are highlighted because these σb values bracket the values reached during typical observations at the IRAM-30 m. For this analysis, ΔV is fixed at 1.1km s−1, but the computations are done for four different values of σV (0.3, 0.6, 1.3,and 2.0 km s−1) and then projected on the (N, Tex) plane (see text for details).

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