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Mean energy distributions from 1500 to 8000 A for different types of galaxies have been derived from satellite ultraviolet-filter photometry and from earth-based spectrum scans. K-corrections for the standard U, B, V filters have been calculated from these energy distributions. The K-corrections are used to calculate the mean redshift, mean observed color, and color distribution of galaxies as a function of apparent magnitude and type in a Euclidean universe, assuming no galaxy evolution and no intergalactic extinction.
W. D. Pence (Thu,) studied this question.