Even though you put limits on the parameters, it is still possible to end up with results that are outside of the limits. This is because the limits are not used when KaleidaGraph attempts to improve upon your initial guesses. The resulting fit will show you KaleidaGraph’s best guess at the final value and this value does not get passed through the limit function.
KaleidaGraph is a thoughtfully designed graphing and data analysis application for research scientists, as well as for those in business and engineering fields. It produces publication-quality graphs, and easily converts the most complex data into a functional display.