Hi. I have made a custom intensity peak/model file, for easy import in relax. The form is: protein 10 L 10 N 3.377659e+05 6.362446e+05 protein 6 V 6 N 1.697771e+06 3.015788e+06 protein 63 Y 63 N 8.673898e+05 1.726064e+06 protein 4 Y 4 N 2.339480e+06 4.039142e+06 protein 67 M 67 N 2.574062e+06 4.313824e+06 protein 5 E 5 N 1.609356e+06 2.927111e+06 protein 65 V 65 N 2.179341e+06 4.067343e+06 protein 38 E 38 N 1.563795e+06 2.921316e+06 protein 7 N 7 N 1.535896e+06 3.005234e+06 protein 75 L 75 N 3.578841e+06 6.352595e+06 This goes fine for model import, with standard settings. Start new analysis Relaxation dispersion analysis Relaxation dispersion experiment type selection CPMG, fixed time Data pipe set up The starting data pipe for the analysis = origin - relax_disp (Mon Jun 3 17:08:30 2013) The data pipe bundle = relax_disp (Mon Jun 3 17:08:30 2013) Click: Spin editor Click: Load spins Make a test file: test.seq Click: From a file containing sequence data The file name = test.seq The spin ID string = Leave empty Free format Molecule name column (mol_name_col) = 1 Residue number column (res_num_col) = 2 Residue name column (res_name_col) = 3 Spin number column (spin_num_col) = 4 Spin name column (spin_name_col) = 5 You can then rename molecule by, right click "Molecule: protein", "Name the molecule", Set "The new molecule name" to for example "Test". Apply, then OK. Add spectra Click "Add" The file name = test.seq The Spectrum ID string: 2,0 The Intensity column: 6,7 rest is default Error: No corresponding data could be found within the file. I can import single wise. best Troels Troels Emtekær Linnet