Syntax: mkteci file1.eci ... where file1.eci etc. is a list of T-dependent eci files obtained with the clusterexpand command, e.g. clusterexpand fvib in the case of vibrational free energy or clusterexpand felec in the case of electronic free energy. Usually the file list is: fvib.eci felec.eci ^vibrational ^electronic free energy