def _nemo_accpars(self,vo,ro):
        """
        NAME:

           _nemo_accpars

        PURPOSE:

           return the accpars potential parameters for use of this potential with NEMO

        INPUT:

           vo - velocity unit in km/s

           ro - length unit in kpc

        OUTPUT:

           accpars string

        HISTORY:

           2018-09-14 - Written - Bovy (UofT)

        """
        GM= self._amp*vo**2.*ro/2.
        return "0,1,%s,%s,0" % (GM,self.a*ro)