Fig. 4
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Vertical section of the Galactic disc as a function of galacto-centric radius, R. Over-dense regions are the spiral arms of the Galaxy seen edge-on. Stars are colour-coded by the probability density function at each bin, calculated as the number of stars in each bin over the total number of stars per bin area, where the bin area is 60 pc (in R) times 30 pc (in Z).
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