def mdev(self, tau0, tau):
        """ return predicted MDEV of noise-type at given tau

        """
        prefactor = self.mdev_from_qd(tau0=tau0, tau=tau)
        c = self.c_mvar()
        mvar = pow(prefactor, 2)*pow(tau, c)
        return np.sqrt(mvar)
def mdev ( self , tau0 , tau ) : prefactor = self . mdev_from_qd ( tau0 = tau0 , tau = tau ) c = self . c_mvar ( ) mvar = pow ( prefactor , 2 ) * pow ( tau , c ) return np . sqrt ( mvar )
return predicted MDEV of noise-type at given tau