Fig. 2

Longitudinal profile for star counts for three ranges of Galactic latitudes. a) | b | ≤ 0.5°; b) 0.5°< | b | ≤ 3.5°; c) | b | > 3.5°. The data are plotted in solid lines, the standard BGM with dotted-dashed lines, sim-1 in dashed lines (see text). The Orion spiral tangents are located at approximately at ℓ ~ 80 and 260°.
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