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Fig. 3.
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Effective selection function for the APOGEE DR17 red clump stars shown in the Galactic (X, Y) plane at b = 0. Each pencil beam corresponds to a different APOGEE pointing. The difference in bright magnitude limit between APOGEE-1 (H = 7 mag) and APOGEE-2 (H = 10 mag) is visible in the fourth quadrant (lower left corner).
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