spectra <int> <int> ()

output files containing spectra (only s000000.dat for the spectrum of the initial time series and resspec.dat for the spectrum of the residuals after prewhitening all significant compontents by default). The parameters are

1. the maximum number of iterations (files s#iteration#.dat), and
2. the step width (number of iterations) for output, p..

The file name may be assigned additional indices for Time-Resolved analysis (p.) and/or MultiFile mode (p.).