code: def set_signal_type(self, sig_type):
          
          if isinstance(sig_type, str):
              sig_type = [sig_type]
          self.snr_input.signal_type = sig_type
          return
docs: Set the signal type of interest.
  
          Sets the signal type for which the SNR is calculated.
          This means inspiral, merger, and/or ringdown.
  
          Args:
              sig_type (str or list of str): Signal type desired by user.
                  Choices are `ins`, `mrg`, `rd`, `all` for circular waveforms created with PhenomD.
                  If eccentric waveforms are used, must be `all`.