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Fig. 1.
Left panel: image of GC1 in the BATC g band obtained with the 60/90 cm Schmidt telescope in the BATC Multicolour Sky Survey, of which the circle is photometric aperture adopted in this paper. Right panel: image of GC1 observed in the F606W filter of ACS/HST, of which the circle around GC1 is of a 6 arcsec radius.
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