name calls method in Kallay’s MRCC program [manual]
mrccsd CC through doubles
mrccsdt CC through triples
mrccsdtq CC through quadruples
mrccsdtqp CC through quintuples
mrccsdtqph CC through sextuples
mrccsd(t) CC through doubles with perturbative triples
mrccsdt(q) CC through triples with perturbative quadruples
mrccsdtq(p) CC through quadruples with pertubative quintuples
mrccsdtqp(h) CC through quintuples with pertubative sextuples
mrccsd(t)_l  
mrccsdt(q)_l  
mrccsdtq(p)_l  
mrccsdtqp(h)_l  
mrccsdt-1a CC through doubles with iterative triples (cheapest terms)
mrccsdtq-1a CC through triples with iterative quadruples (cheapest terms)
mrccsdtqp-1a CC through quadruples with iterative quintuples (cheapest terms)
mrccsdtqph-1a CC through quintuples with iterative sextuples (cheapest terms)
mrccsdt-1b CC through doubles with iterative triples (cheaper terms)
mrccsdtq-1b CC through triples with iterative quadruples (cheaper terms)
mrccsdtqp-1b CC through quadruples with iterative quintuples (cheaper terms)
mrccsdtqph-1b CC through quintuples with iterative sextuples (cheaper terms)
mrcc2 approximate CC through doubles
mrcc3 approximate CC through triples
mrcc4 approximate CC through quadruples
mrcc5 approximate CC through quintuples
mrcc6 approximate CC through sextuples
mrccsdt-3 CC through doubles with iterative triples (all but the most expensive terms)
mrccsdtq-3 CC through triples with iterative quadruples (all but the most expensive terms)
mrccsdtqp-3 CC through quadruples with iterative quintuples (all but the most expensive terms)
mrccsdtqph-3 CC through quintuples with iterative sextuples (all but the most expensive terms)