https://www.steletch.org/spip.php?page=article&id_article=18 Before finding the wonderful XmGrace software, i'd loose time to do calculations, regressions, etc. With this software, i've been able to do in a more robust manner and more rapidly everything i could do before and much more. Here are some examples of what i'm using. Some basics commands i use with XmGrace are detailed below. Renormalizing a plot (mostly angles between -180 and +180, you want it between 0 and 360 ) Load your file into xmgrace Go to (…) en SPIP - www.spip.net