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Equilibrium geometries and relative energies (ZPE corrections are included) for the different MC3N (M=Mg,Ca) isomers obtained at the MP2/aug-cc-pVTZ and the CCSD(T)/aug-cc-pVTZ//MP2/aug-cc-pVTZ levels respectively. Distances are given in Ångstroms. Upper values are for MgC3N species, whereas lower values (in Italics) correspond to CaC3N isomers.
