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Fig. 1.

image

Histogram of (J − K)0 of long-period variables. Top panel: halo C stars. Middle panel: stars in our sample for which the height |Z| from the Galactic plane is larger than 5 kpc. Lower panel: as middle panel, but |Z| < 5 kpc. We do not include irregular variables, with no well-defined periodicity (they are ignored in this paper) in any of the panels.

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