Hi. The relax disp manual, on page: 152 in section: 10.6.1 Dispersion script mode – the sample script The sample script has: # The dispersion models. MODELS = ['R2eff', 'No Rex', 'LM63', 'CR72', 'IT99', 'N2 2-site expanded'] The error message is: relax_disp.select_model(model='N2 2-site expanded') RelaxError: The model 'N2 2-site expanded' must be one of ['R2eff', 'No Rex', 'LM63', 'TSMFK01', 'LM63 3-site', 'CR72', 'CR72 full', 'IT99', 'M61', 'DPL94', 'M61 skew', 'TP02', 'NS 2-site 3D', 'NS 2-site 3D full', 'NS 2-site star', 'NS 2-site star full', 'NS 2-site expanded']. The error is a "2" instead of "S" in MODELS = ['R2eff', 'No Rex', 'LM63', 'CR72', 'IT99', 'N2 2-site expanded'] Should be: MODELS = ['R2eff', 'No Rex', 'LM63', 'CR72', 'IT99', 'NS 2-site expanded'] Best Troels Emtekær Linnet