Fig. 4
Maps of gas column densities in three phases, smoothed with a Gaussian kernel of 0.6°. The marks are the same as in Fig. 1. Left: H I column density derived from 21-cm all-sky survey. Middle: H2 column density derived from the CO data. Right: H II column density derived from the Planck free–free map. For details, see the context in Sect. 3.
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