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RuntimeWarning: invalid value encountered in arccos

When generating the precession SNR for certain configurations, there is sometimes a RuntimeWarning printed:

.../pesummary/gw/conversions/angles.py:62: RuntimeWarning: invalid value encountered in arccos
  dphi = -1. * sign * np.arccos(cos_d)

This is likely because cos_d takes value e.g. 1.00000000004.