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Fig. 6

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Raw light curves and flash duration. Data points show the individual measurement for each frame. Error bars come from the pixel noise in the short-time exposures and small errors in the stacking procedure. They are estimated by examining the oscillations of the light curve when there is no flash in the image. Color curves represent fits to the data with running averages of 5 points. Vertical dotted blue lines represent the central flash where the structure of the flash is discernible in each individual frame. Vertical dotted green lines mark times when the flash is difficult to identify in individual frames but is observable in the difference images. Insets show the circular box of pixels used to extract the differential photometry and the flash in the brightest frame. G. Hall’s light curve displays a Gaussian fit shown in green. Photometric values obtained without correcting the partial saturation at the center of the impact are represented with triangles; corrected values are displayed with circles and were used for the fit. Horizontal dark-green arrows show the interval of time used to integrate the light curve in each case and are consistent with the longest duration of the flash when several observations are available. Order of magnitude differences in the digital number (DN) values come from differences in codification of brightness values in different videos.

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