code: def calc_accel_tf(self, lin, lout):
          
          tf = self.wave_at_location(lout) / self.wave_at_location(lin)
          return tf
docs: Compute the acceleration transfer function.
  
          Parameters
          ----------
          lin : :class:`~site.Location`
              Location of input
          lout : :class:`~site.Location`
              Location of output. Note that this would typically be midheight
              of the layer.