> Rainer: > > Then you derive the standard deviation of these? > > Bob Young Yes, the standard deviation of the r-values of the simulated distributions. the average r of the simulated ones should be close enough to the input-r, of course, to make sure you have a good statistical sample. rainer To stop getting email from the 'meteorobs' list, use the Web form at: http://www.meteorobs.org/subscribe.html