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L. Crews (Vanderbilt U.), R. Harmon (Randolph Macon Coll.), D. Hall (Vanderbilt U.)
Matrix Lightcurve Inversion (MLI) is a technique for mapping the surface intensity structure of spotted variable stars. In this paper we show the results of using multi-color wideband photometry as the input to MLI from both simulations and actual data. As expected, the simulated results show a marked improvement over single-color photometry in both correct reproduction of spot latitudes and in the resolution of two spots. Data taken by the Vanderbilt 16-inch APT in B and V differential magnitudes was analyzed by MLI and compared with previous results using just the V magnitudes. Single-color photometry had always shown an unnaturally narrow range in spot latitudes centered around the sub-earth point. The multi-color results yield a significantly larger range in spot latitudes and possibly a better reproduction of the actual surface.