14.5 QC3 fit small L

We minimise the $\chi^2$ $$\chi^2= \sum_i \frac{( \Delta E_2^{predicted} -\Delta E_2^{latt})^2}{\sigma^2}$$

$$K_{df}=\frac{P[0] M_0^2 }{E^2+M_r^2}$$

$$\begin{gather} \chi^2/d.o.f.=157.824 \\ P[0]=19.7711\pm (3.9) \\ P[1]=9.66828\pm (0.8) \\ \end{gather}$$ { $$\begin{gather} C=\begin{pmatrix} 15& 0.0393\\ 0.0393& 0.639\\ \end{pmatrix} \end{gather}$$ }