As part of the Citizen Sky Mira Fourier Coefficient team's efforts, there is a need to generate relative amplitudes and phases from a model containing harmonics of one or more fundamental frequencies.
Grant Foster has written to me explaining what is required. Information about this can also be obtained from his Light Curve Analysis book, section 9.5.
As pre-cursors to this, the ability to include harmonics in models must be added. In addition, finding harmonics in a period analysis result will also help to determine how many should be included in a model.