code: def get_magnitude_term(self, C, rup):
          
          b0, stress_drop = self._get_sof_terms(C, rup.rake)
          if rup.mag <= C["m1"]:
              return b0
          else:
              # Calculate moment (equation 5)
              m_0 = 10.0 ** (1.5 * rup.mag + 16.05)
              # Get stress-drop scaling (equation 6)
              if rup.mag > C["m2"]:
                  stress_drop += (C["b2"] * (C["m2"] - self.CONSTANTS["mstar"]) +
                                  (C["b3"] * (rup.mag - C["m2"])))
              else:
                  stress_drop += (C["b2"] * (rup.mag - self.CONSTANTS["mstar"]))
              stress_drop = np.exp(stress_drop)
              # Get corner frequency (equation 4)
              f0 = 4.9 * 1.0E6 * 3.2 * ((stress_drop / m_0) ** (1. / 3.))
              return 1. / f0
docs: Returns the magnitude scaling term in equation 3