Spectral responses of the combination of cameras and filters for the impacts in March 2016 (top panel) and May 2017 (bottom panel). Note the better quantum efficiency of the ASI224MC camera used by S.P. for the May 2017 impact when compared with the ASI120MC used by T.R. and the QHY5LII camera used by G.K. for the impact in March 2016. All the color filters used correspond to Bayer mask filters on the CCD.
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