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We present photometry and spectroscopy for seven deep fields containing distant clusters of galaxies with 0.35 <z <0.55. Positions and photometric parameters, including r-magnitudes, g - r and r - i colors, surface brightnesses, and photometric profile types are given for ~ 2000 galaxies. We have obtained low-resolution spectroscopy from which redshifts have been determined for 289 objects, of which 190 are cluster members. We classify these according to dominant spectral features and plot examples in each cluster. Color-magnitude and color-color diagrams are formed which show trends in the cluster populations, and maps are made of the cluster field using the color-color relations to increase the contrast of cluster over field. Galaxies with spectra typical of old stellar populations cluster most strongly, with active galaxies, those with recent or ongoing star formation, or an active nucleus, distributed more diffusely. The g - r color is well correlated with active star formation as judged from spectral features. Some other weaker correlations with surface brightness and profile types are briefly discussed.
Dressler et al. (Wed,) studied this question.