Figure 5

Sketches of the curves \(W_C\) and \(W_G\) for values of \({\overline{Q}}\) in the three ranges (a) \({\overline{Q}}<{\overline{Q}}_1\); (b) \({\overline{Q}}\in ({\overline{Q}}_1, {\overline{Q}}_2)\) and (c) \({\overline{Q}}_2<{\overline{Q}}\). In (a), for clarity, only a subset of the y-axis range is shown. Note that \(W_G\) approaches very close to, but always lies above, the curve \({\Gamma }_{l\mathrm{0}}\).