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frm_cross_spectrum()
The cross-spectrum of a pair of signals, as rows a model can read
frm_cross_pairs()
The cross-spectra of several channel pairs, stacked with a pair factor

Fit and read the fit

cross_wishart()
The complex Wishart family for a pair of signals
frm_coherence() frm_phase()
Coherence and phase from a fitted coupling model, with intervals
frm_cross_simulate()
Draw whole cross-spectral matrices from a fitted coupling model