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Fig. A.1

image

Spectrum of the H2 1–0 S(1) line in the SW galaxy of the IRAS 12112+0305 galaxy-pair, that is, the galaxy that does not host the prominent outflow. Plotted on the y-axis is the ratio of the emission-line flux and the continuum flux. The spectrum is extracted from a region of five pixels (three pixels both E to W and N to S), centered on the peak of the continuum emission. The red line shows a single Gaussian function, which accurately fits the H2 line. This plot shows that the weak broad-component emission from Fig. 2 is merely a result of our uncertainty in the Gaussian fitting procedure due to the underlying strong continuum emission of this source.

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