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The large-scale layer structure of the gas spiral arms of Galaxy (figures 1 and 2) was found out for the first time in the galactic longitudes 10 - 40 degrees, of distances of 6 kpc from the centre of Galaxy right up to its external part. 3-4 large-scale layers of thickness 600 - 800 pc is usuall observed in the arms across the plane of Galaxy. The distance between layers in external parts of Galaxy is 1 - 1,5 kpc. ![]() Figure 1. The distribution of the emission of the HI line on wave length 21 cm on radial velosities corresponding to external spiral arms. ![]() Figure 2. The location of layers HI of the external spiral arm. |