For my 3rd year project, I have a set of data which is the variation within an interference pattern. The outcome has clear sine curve properties (Alternating peaks and troughs of intensity) but the positions aren't regular (i.e. the peak-to-peak distance between peak1 and peak2 is larger than the distance between peak2 and peak3). I have tried using SciDAVis to plot this curve but it finds a best-fit/average kind of sine curve, not a fit that passes through all the available points. Is there a method or program that will help me? I would preferably be able to make a note of the equation of the curve in order to plot it with other sine curves of the interference pattern from other varying distances from the sources.