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Fig. C.1

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Normalised χ2 maps (χmin2/χ2)$\left( {\chi _{_{\min }}^2/{\chi ^2}} \right)$ for CO2 (top left), HCN (top right), and C2H2 (bottom left). The dark plus indicates the best fitting parameters, while red, orange, and yellow contours indicate the 1σ-, 2σ-, and 3σ-confidence intervals, respectively. The white contours indicate the emitting radii in au.

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