Graph of phase shift $\Delta P_0$ vs electron trapping efficiency parameter $\beta $

<p>Graph of phase shift $\Delta P_0$ vs electron trapping efficiency&nbsp; parameter $\beta $, taking rest of&nbsp; parameters as&nbsp; $\varepsilon =0.1$, $\phi _m=1$, $\alpha =3.5 $, $\mu =0.56$ and $\nu=0.44$. The upper curve for&nbsp; $q =0.25$ (red line), middle one for $q=0.5$ (green line) and lower one is $q= 0.75 $ (blue line).</p>