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34. NMREN1: Nuclear Magnetic Resonance Energy Level Program by J. D. Swalen, IBM Research Laboratories, San Jose, California 95193 This program solves for the spin energy levels by a least-squares technique on the assigned observed NMR transitions. Errors are also calculated for each energy level. The trace relation (Trk=0) is included. The output is punched on cards for direct use with NMRIT (QCPE 33). FORTRAN II and FAP (IBM 7090) Lines of Code: 700 Recommended Citation: J. D. Swalen, QCPE 11, 34 (1964).