Fig. 2

l−v diagrams at b = 0° for the H I emission in the regions QI (top row) and QIV (bottom row) of the Milky Way. The leftmost panels show our one-component model, the central panels show our two-component model, and the rightmost panels show the LAB data. Brightness temperature contours range from 0.1 K (or 4 times the rms noise) to 102.4 K in multiples of 2.
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