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Fig. 8


H2 excitation diagram of the extended emission-line region and the compact source (Sect. 3.1). The dashed and solid red lines show the gas excitation temperature derived from fitting the H2 population in the rotational states of the v = 1 vibrational state, and from the ratio between the J = 1 level of the v = 1 and v = 2 states, respectively.

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