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Variants of the family of the recently developed Multireference Equation of Motion Coupled Cluster (MR-EOMCC) approaches are applied to the atomic excitation spectra of the neutral and the +1 and +2 charged first-row transition metal atoms Cr, Mn, Fe and Co. Scalar relativistic effects are considered but spin–orbit coupling is not included. Using a single set of state-averaged CASSCF orbitals and...