I see in the NumPy Book that there are functions to allow generation of beta, binomial, and poisson curves, but I don't see one for normal curves. Is there such a function? Currently I'm using code (I forget from where) that creates a Gaussian distribution, but the tails do not reach zero (within the range of the x axis) unless the inflection point is less than 0.5 on the y axis. I'm using PyX to plot the resulting curves and would like to avoid re-inventing the wheel. If there's python code to calculate a normal distribution given the center, width, and inflection point I would appreciate a pointer to the source. Rich -- Richard B. Shepard, Ph.D. | Integrity Credibility Applied Ecosystem Services, Inc. | Innovation <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863