In the series of almost useless small free software : DBWBAC http://pcb4122.univ-lemans.fr/ftp/dbwbac.zip The purpose is to calculate the background corresponding to the DBW or FULLPROF 6th order polynomial. This may be useful if you consider that the background is almost correct, but could be manually improved in some part of the powder pattern (not so rare :-). This program runs under Win95 and probably Win98 or NT. Nothing that you could not do with Excel or (...), but sometimes it serves ;-). The zipped file contains the executable, the Fortran source, a data set, a manual. Armel Le Bail - Universite du Maine, Laboratoire des Fluorures, CNRS ESA 6010, Av. O. Messiaen, 72085 Le Mans Cedex 9, France http://www.cristal.org/