Fig. 18
Excitation diagram for the knots listed in Table 7. The entries for each knot are indicated with different symbols and colours and are calculated from the de-reddened line intensities in units of erg s-1 cm-2 sr-1 according to the relation given in the text. Linear fits are made to the points for each knot. Column densities N(v,J) are in the units of cm-2.
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