good evening everybody, i just started exposing myself to the nyqvist-topic and even i might be on the risk of boring the specialists out there i have another question for my better understanding: if i fit my data in k-space without any fourier filtering and backtransforming etc. what value of /dr/ do i have to use when calculating the N_ind? i hope it is just that range in the r-space, which contains significant (or according to my structural model used reasonable) structural data, i.e. the range i would use if i would filter the data....!? thanks for your help, regards matthias -- Matthias Bauer Universität Stuttgart Institut für Physikalische Chemie Arbeitskreis Prof. Dr. H. Bertagnolli Pfaffenwaldring 55 70569 Stuttgart (Vaihingen) Telefon: (+49) 0711-685-64472 Fax: (+49) 0711-685-64443 E-Mail: m.bauer@ipc.uni-stuttgart.de homepage: http://www.ipc.uni-stuttgart.de/~matthias/index.htm