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Fig. 4

(g − r) vs. r (CM diagram) showing the selection function for one of the fields located towards approximate l ~ 322.1°, b ~ 60.1°. The bins are colour-scaled based on the NLAMOST/NSDSS with sizes of 0.05 mag in (g − r) colour and 0.3 mag in r. The dashed box shows the overall colour and magnitude cuts used for LAMOST.
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