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We report a large-scale coronal wave (so-called "EIT wave") observed withhigh cadence by EUVI onboard STEREO in association with the GOES B9.5 flare anddouble CME event on 19 May 2007. The EUVI instruments provide us with theunprecedented opportunity to study the {\it dynamics} of flare/CME associatedcoronal waves imaged in the extreme ultraviolet. The coronal wave under studyreveals deceleration, indicative of a freely propagating MHD wave.Complementary analysis of the associated flare and erupting filament/CME hintat wave initiation by the CME expanding flanks, which drive the wave only overa limited distance. The associated flare is very weak and occurs too late toaccount for the wave initiation.

High cadence observations of a global coronal wave by EUVI/STEREO