Sergey Koposov (with great wizadry) obtained quickly a sample of halo M-giants and their SDSS-USNO proper motions. A very large fraction of halo M giants live in the observed Milky Way substructure, presumably because the substructure is higher in metallicity than the general halo population (and higher metallicity giants are redder/cooler than typical halo K giants). The histograms of proper motions for these halo giants are not promising for statistical proper motion work, although Rix and I have no fear.
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