GSASIntroductionWelcometotheGeneralStructureAnalysisSystem(GSAS).GSASisasetofprogramsfortheprocessingandanalysisofbothsinglecrystalandpowderdiffractiondataobtainedwithx-raysorneutrons.Itiscapableofhandlingallofthesetypesofdatasimultaneouslyforagivenstructuralproblem.Inaddi