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We compare quiescent and flare X-ray spectra of the RS CVn binary Sigma Gemobtained with the Chandra and XMM-Newton grating spectrometers. We find that inaddition to an overall 25% flux increase, which can be ascribed to variationsin the system's quiescence activity over the 15 months that passed between theobservations, there is a hot plasma component of kT_e > 3 keV that arises withthe flare. The hot component is manifested primarily by emission from highcharge states of Fe and by a vast continuum. The cooler (kT_e < 2 keV) plasmaremains undisturbed during the flare. We find no significant variations in therelative abundances during the flare except for a slight decrease (<30%) of Oand Ne.Comment: 6 pages, 4 figures, Accepted for publication in A&

On temperature and abundance effects during an X-ray flare on σ Geminorum