Fig. 1.

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Density, ρ, of Mira variable stars as a function of galactocentric coordinates (the X axis is in the Sun-Galactic centre direction such that X⊙ = +8.2 kpc) in the ranges |X|≤2750 pc, |Y|≤2750 pc, and 700 pc < |Z|< 1500 pc. Bin sizes are 500 × 500 × 200 pc, which implies a Poissonian error of the density in each bin equal to with ρ1 = 20 star kpc−3; for ρ = 0, Δρ = ρ1. Over-imposed white contours show isodensity regions.
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