Sig.Array2FFT of Bigarray.Array2.
type 'l complex_array = (Stdlib.Complex.t, complex_elt, 'l) Stdlib.Bigarray.Array2.tDouble precision complex 2D array.
type 'l float_array = (float, float_elt, 'l) Stdlib.Bigarray.Array2.tDouble precision float 2D array.