spectral: add feature to select a single freq (or a list of freqs) and compute the patterns for each one (saving the pattern for all freqs is impossible for large datasets ~40 Gb for 150 years)
spectral: add feature to select a single freq (or a list of freqs) and compute the patterns for each one
(saving the pattern for all freqs is impossible for large datasets ~40 Gb for 150 years)