<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def smoothness(self, convert_to_muC_per_cm2=True, all_in_polar=True):
 """ Get rms average difference between spline and same branch polarization data. """

        tot = self.get_same_branch_polarization_data(
            convert_to_muC_per_cm2=convert_to_muC_per_cm2, all_in_polar=all_in_polar)
        L = tot.shape[0]
        try:
            sp = self.same_branch_splines(convert_to_muC_per_cm2=convert_to_muC_per_cm2,
                                          all_in_polar=all_in_polar)
        except:
            print("Something went wrong.")
            return None
        sp_latt = [sp[i](range(L)) for i in range(3)]
        diff = [sp_latt[i] - tot[:, i].ravel() for i in range(3)]
        rms = [np.sqrt(np.sum(np.square(diff[i])) / L) for i in range(3)]
        return rms