Fig. 2
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Residual (O–C) in alt-azimuth coordinate system against (g – r)PS1 before and after DCR correction. The top two panels are (O–C) before and after DCR correction for Obs16. The bottom two panels are (O–C) before and after DCR correction for Obs17. We note that the results of Obs17 are based on the stars brighter than 18 Gmag and the results of Obs16 are based on the stars brighter than 17 Gmag.
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