Use the code, run two cases with plot hold on:

fix h $=6$ W$/$m$^2-$K$,$ run the code for E $=0$ and E $=0\mathrm{.}8.$

Fix h $=30$ W$/$m$^2-$K$,$ run the code for E $=0$ and then E $=0\mathrm{.}8.$