Dear Mauricio, following up to Bruce's reply, I suggest using a small script (PERL, awk, whatever you prefer) to extract just the information needed by ATHENA/ARTEMIS. This is what I usually do with my raw data. In your case, e.g. a gawk '{print $3,$4,$5,$6}' infile > outfile (or whatever columns you need) would do a great job. In case you have bash available, you can even make a fancy loop: for i in `ls *.dat`;do gawk '{print $1,...}' $i > $i.ext ; done which makes you a ".dat.ext" out of every ".dat" file. Feel free to ask me in case you want to know a bit more on linux-scripting - it's anyway a good tool for spectroscopy :) Cheers, Norbert -- Dr. rer. nat. Norbert Weiher (weiher@chem.ethz.ch) Institute for Chemical and Bioengineering - ETH Hönggerberg HCI E 117 - 8093 Zürich - Phone: +41 1 63 3 48 32