Fig. 8.
Image of the southern arm with the HI map in the background and colors underlining the CO core-envelope cloud structure that follow a power-law PDF. For the CO emission we plot in yellow all pixels with molecular surface densities 1021 < NH < 2.5 × 1021 cm−2, in cyan all pixels that have 2.5 × 1021 < NH < 4 × 1021 cm−2, and finally, we show in blue the core of GMCs with NH > 4 × 1021 cm−2.
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