Returns the frequency of the peak of the seismic oscillation modes envelope.
At present, the only method supported is based on using a
2D autocorrelation function (ACF2D). This method is implemented by the
estimate_numax_acf2d function which accepts
the parameters numaxs, window_width, and spacing.
For details and literature references, please read the detailed
docstring of this function by typing lightkurve.seismology.estimate_numax_acf2d?
in a Python terminal or notebook.
Method to use. Only "acf2d" is supported at this time.
Numax of the periodogram, including details on the units and method.