Use the Edit General command to add a new fit to the list. Enter the same fit equation and a new set of initial guesses. You can then apply the first curve fit to one set of data and the second fit to the other data.
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.