Fig. 2
Grid constraining the excitation temperature and column density of HDCO. The cross marks the best fit values, 1.3 ± 0.2 × 1017 cm−2 and 106 ± 13 K from interpolation of the values within the marked area. The contour line marks the Δχ2 = 2.3 region. We note that the column density value has been corrected for the continuum. The dots show the evaluated column densities and excitation temperatures.
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