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In this paper we present experimental atomic data for forbidden [FeII] transitions that are observed as strong features in astrophysical spectra.\n  Aims: To measure lifetimes for the 3d^6(^3G)4s a ^4G_{11/2} and 3d^6(^3D)4s b ^4D_{1/2} metastable levels in FeII and experimental transition probabilities for the forbidden transitions 3d^7 a ^4F_{7/2,9/2}- 3d^6(^3G)4s a ^4G_{11/2}.\n  Methods: The lifetimes were measured at the ion storage ring facility CRYRING using a l","authors_text":"E. Backstrom, H. Hartman, H. Nilsson, J. Gurell, L.O. Norlin, P. Royen, R. Blackwell-Whitehead, S. 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