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We present a catalog of 1921 spectroscopic redshifts measured in the fieldsof the massive galaxy clusters MACSJ0416.1--2403 ($z=0.397$), MACSJ0717.5+3745($z=0.546$), and MACSJ1149.5+2223 ($z=0.544$), i.e., three of the four clustersselected by STScI as the targets of the Frontier Fields (FF) initiative forstudies of the distant Universe via gravitational lensing. Compiled in thecourse of the MACS project (Massive Cluster Survey) that detected the FFclusters, this catalog is provided to the community for three purposes: (1) toallow the identification of cluster members for studies of the galaxypopulation of these extreme systems, (2) to facilitate the removal of unlensedgalaxies and thus reduce shear dilution in weak-lensing analyses, and (3) toimprove the calibration of photometric redshifts based on both ground- andspacebased observations of the FF clusters.

Spectroscopic redshifts of galaxies within the Frontier Fields