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" ... Second, when computing probabilities of asteroids versus comets, they performed an analysis to compute the fraction of main belt asteroids that could provide a match to the impactor: a reasonable approach, but arriving at a figure that is only about ~10% of main belt asteroids, when a fuller analysis indicates that figure is probably 20% or higher. However, they then assumed that 100% of comets could match the carbonaceous chondrite composition of the layer separating the Mesozoic from the Cenozoic eras: a double-standard that unfairly downweights the likelihood of an asteroidal nature while similarly unfairly upweighting the likelihood of cometary origins. ... "