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PrismaKantenspektrum.svg Zeichnung Prisma vor Auge um Kantenspektren zu sehen Prisma vor Fotoapparat um Kantenspektren zu dokumentieren eigene Zeichnung Febr Dr Ing Wetzel swetzel ch html alias PrismaNN oder Analemma PDrelease Original upload log de Ireas CommonsHelper page de PrismaKantenspektrum svg PrismaNN bytes no