code: def _extra_regression_kwargs(self):
          
  
          # larger than default sometimes needed when extrapolating
          omega_switch_test = 0.019
  
          extra_args = []
          extra_args.append({
              'omega0': 5e-3,
              'PN_approximant': 'SpinTaylorT4',
              'PN_dt': 0.1,
              'PN_spin_order': 7,
              'PN_phase_order': 7,
              'omega_switch': omega_switch_test,
              })
  
  
          extra_args.append({
              'omega0': 6e-3,
              'PN_approximant': 'SpinTaylorT1',
              'PN_dt': 0.5,
              'PN_spin_order': 5,
              'PN_phase_order': 7,
              'omega_switch': omega_switch_test,
              })
  
          extra_args.append({
              'omega0': 7e-3,
              'PN_approximant': 'SpinTaylorT2',
              'PN_dt': 1,
              'PN_spin_order': 7,
              'PN_phase_order': 5,
              'omega_switch': omega_switch_test,
              })
  
          # These should be pure NRSur7dq2
          extra_args.append({'omega0': 3e-2})
          extra_args.append({'omega0': 5e-2})
  
          return extra_args
docs: List of additional kwargs to use in regression tests.