code: def get_mean_and_stddevs(self, sites, rup, dists, imt, stddev_types):
          
          C = self.COEFFS[imt]
  
          imean = (self._get_magnitude_term(C, rup.mag) +
                   self._get_distance_term(C, dists.rrup, sites.backarc) +
                   self._get_site_term(C, sites.vs30) +
                   self._get_scaling_term(C, dists.rrup))
          # Convert mean from cm/s and cm/s/s and from common logarithm to
          # natural logarithm
          if imt.name in "SA PGA":
              mean = np.log((10.0 ** (imean - 2.0)) / g)
          else:
              mean = np.log((10.0 ** (imean)))
          stddevs = self._get_stddevs(C, 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.