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SIS: Castor/YY Gem
ASCA SIS images of the Castor/YY Gem multiple star system, separated
by ~70 arcsec. The bottom row shows the smoothed images, while the top row shows
the result of Lucy-Richardson maximum likelihood reconstruction. Normally
(middle column), YY Gem is much brighter than Castor in X-rays.
However, we observed flares from YY Gem (right) and Castor (left);
during the latter, Castor became brighter than YY Gem.