Fig. 3
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K vs. Bp − K CMD of HP 1. The cyan line shows a portion along the RGB sequence of a 13.0 Gyr isochrone with [M/H] = −0.90 shifted using E(B–V) = 1.01 and (m-M)0 = 14.10. Gray points represent nonmember stars (according to proper motions). Red circles represent member stars, blue circles member stars corrected for differential reddening, and green circles our targets.
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