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The approach is utilized to obtain extrapolated correlation energies from raw values calculated with second-order M\u00f8ller-Plesset perturbation theory and the coupled-cluster singles and doubles excitations method, some of the latter also with the perturbative triples corrections. The calculated correlation energies have also been used to predict atomization energies within an additive scheme. Good agreement is obtained with the best available estimates even when the (d, t) pair of hierarchical numbers is utilized to perform the extrapolations. This conceivably justifies that there is no strong reason to exclude double-zeta energies in extrapolations, especially if the basis is calibrated to comply with the theoretical model.<\/jats:p>","DOI":"10.1063\/1.4903193","type":"journal-article","created":{"date-parts":[[2014,12,10]],"date-time":"2014-12-10T18:00:33Z","timestamp":1418234433000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":91,"title":["Narrowing the error in electron correlation calculations by basis set re-hierarchization and use of the unified singlet and triplet electron-pair extrapolation scheme: Application to a test set of 106 systems"],"prefix":"10.1063","volume":"141","author":[{"given":"A. J. 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