Hi All, I am new to this mailing list. I am struggling to get Modelfree4 working on my data. I got macros that will create the input files for me and even though the Modelfree4 manual says that the input files are free format files I get the error message: Error during input, file=mfpar ERROR = 9 Modelfree4 runs well with the testing files that come with it, but it would not run with my data. Should I turn to work with the program relax? I have never analyzed dynamics data so I cannot judge which program is better and more user-friendly. Thank you in advance, Krisztina Krisztina Z. Bencze, Ph.D. Research Associate Wayne State University Department of Biochemistry and Molecular Biology Scott Hall, Rm. # 4323 540 E. Canfield Ave. Detroit, MI, 48201 phone: (313) 577-0186 fax: (313) 577-2765 E-mail: kbencze@xxxxxxxxxxxxx