Fig. 2
Left panel: example of poor subtraction of images of NGC 7130 with large seeing differences (FWHM = 1.5″, with FWHM = 0.4″′ for the reference). Right panel: optimal subtraction for two images with similar good seeing (FWHM = 0.4″). In both panels the source in the lower left quadrant is SN 2010bt (cf. Fig. 3). The FOV in both panels is about 2′ × 2′.
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