In reply to Oliver Kuss.

A colleague pointed out that you can use the PARMS statement to control the initial guess for the parameter values. This will enable the radial smoother to pick up various cycles, as follows:

parms (200) (10); /*----yields annual cycle ---*/
/* parms (2) (10); ----yields El Nino cycle ---*/
/* parms (0) (10); ----yields trend ---*/