Sub-samples of red clump stars selected from the initial conical selection described in Sect. 2, in Galactic Cartesian coordinates, centred at the solar radius, (x, y) plane (top panel), and (x, z) plane (bottom panel). The five sub-samples delimited in the northern hemisphere (z > 0) are colour-coded. Top panel: cylindrical grid is superimposed in black solid lines. The colours given in the legends are those taking the same notation as described in the text (Sect. 3.1). Bottom panel: distribution of all sub-samples used in this study, 10 volumes, (colour-coded in the north, blue in the south) with respect to the Galactic plane (z = 0). The dashed lines illustrate the intersection of the conical selection and the plane y = 0.
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