23.27 energy level fit g=0.25

$$\frac{k}{m} \cot{ \delta}=\frac{1}{am}+\frac{r_0 m }{2}\frac{k^2}{m^2}$$ $P[0]=am$ , $P[1]=r_0m$

$$\begin{gather} \chi^2/d.o.f.=3.00305 \\ P[0]=-1013.76\pm (3.5e+04) \\ P[1]=-90.9154\pm (2.7) \\ \end{gather}$$ { $$\begin{gather} C=\begin{pmatrix} 1.21e+09& 0.325\\ 0.325& 7.1\\ \end{pmatrix} \end{gather}$$ }