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Fig. 4

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Case where noise has resulted in a high β value. In the middle frame, the black curve is the spectrum obtained from the cloud modelling. The red symbols are the measurements that include noise and the red curve is the fit to these points. The uppermost frame shows the deviations ΔIν (the difference between the simulated observation and the fit) in units of the assumed uncertainty σIν. The bottom frame shows the χ2 values as a function of TC and βObs. The colour plot and the white contours show the χ2 values for the fit to the noisy data. The contours are drawn at 1.02, 1.05, 1.1, 1.5, 2.0, 4.0, and 8.0 times the minimum χ2 value. In yellow are shown the corresponding contours for the fit to the noiseless data. The two circles denote the locations of the χ2 minima with (red circle) and without (green circle) the noise.

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