<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_curve_prime(self):
 """not in SPD documentation. same as k, but using the segment instead of the full data set"""

        if len(self.x_Arai_segment) < 4:
            self.pars['specimen_k_prime'], self.pars['specimen_k_prime_sse'] = 0, 0
            return 0
        data = lib_k.AraiCurvature(self.x_Arai_segment, self.y_Arai_segment)
        self.pars['specimen_k_prime'] = data[0]
        self.pars['specimen_k_prime_sse'] = data[3]