Comment (by Giuseppe Ficarra):

In ID_SF_BS, since wR and wI are free parameters, I recommend to add reference value as list for each spin parameter. Leaver method does not convergence for wR and wI which are not eigenvalue of the boundary value problem.

I agree with this comment, but in param.ccl there is a reference value for wR and wI for a specific case (dimensionless spin 0.99 and mass parameter 0.42). Moreover the paper on which the routine is based is cited more than once in the README. My question is: do I need to add an explicit comment inside the source code about this?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2485/include-complex-and-real-scalar-evolution