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Fig. 1
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Through-slit images of the two observations. Upper row: Positions of KIC 10657664 and the reference stars (REF-A1 to A4) in CCD1 and CCD2. Lower row: Positions of KIC 9164561 and the reference star (REF-B1) in CCD1. The red mark is the GTC Nasmyth rotator center. Only a part of the data section is displayed for clarity.
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