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1 .IntroductionDuringthepast 1 5yearsthecapabilitytomakemulti-λλobservationsofthemajorenergysourcesinthecentersofActiveGalaxieshassuppliedAstrophysicswithaverypowerfulnewtoolforthestudyoftheseobjects.Mostoftheseapplicationshavebeendrivenbythesimultaneousa