CENTRAL MG2 INDICES FOR EARLY-TYPE GALAXIES

We present 210 new measurements of the cen- tral absorption line-strength Mg2 index for 87 early-type galaxies drawn from the Prugniel & Simien (1996) sam- ple. 28 galaxies were not observed before. The results are compared to measurements published previously as available in HYPERCAT, and rescaled to the Lick sys- tem. The mean individual internal error on these mea- surements is 0: 009 0: 003 and the mean external error is 0: 012 0: m 002 for this series of measurements.