Figure 15

\({{\rm N}}_{G}(\eta )\) against \({\alpha }_{1}\) when \({{\rm{{\rm B}}}}_{r}=1.2,\,{{\rm{{\rm N}}}}_{r}={\rm{{\rm M}}}=1.5,\,{\sigma }_{1}=0.4,\,{N}_{b}={N}_{t}=0.7,\,{{\rm{{\rm P}}}}_{r}=6.4,\,{E}_{c}=0.4\).