Internally, the coefficients are stored in double precision format. The number of decimals displayed is determined by what is selected in the Equation Label Format dialog (Plot menu). If you change the number of decimals, the curve fit is recalculated and the number of decimals in the coefficients will reflect the change.
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.