code: def get_mean_and_stddevs(self, sites, rup, dists, imt, stddev_types):
          
          # extracting dictionary of coefficients specific to required
          # intensity measure type.
          C = self.COEFFS[imt]
  
          mean = (self._get_magnitude_scaling_term(C, rup.mag) +
                  self._get_distance_scaling_term(C, rup.mag, dists.rrup) +
                  self._get_style_of_faulting_term(C, rup.rake) +
                  self._get_site_scaling_term(C, sites.vs30))
  
          stddevs = self._get_stddevs(imt,
                                      rup.mag,
                                      len(dists.rrup),
                                      stddev_types)
          return mean, stddevs
docs: See :meth:`superclass method
          <.base.GroundShakingIntensityModel.get_mean_and_stddevs>`
          for spec of input and result values.