Starting work on dip in mobility. Not finished.

@Ternary_model/gamma0.m

@@ -3,7 +3,17 @@ function g0 = gamma0(x, a, b, e_g0, u_g0, vt, e, u0)
 %   Based on a tanh profile.
 if isnumeric(e_g0)
     g0 = e_g0*(tanh((x+a+vt)/b)+1)/2+u_g0;
-else
+elseif strcmp(e_g0, 'const')
     g0 = u_g0./(1-Ternary_model.phi_tot(x, a, b, e, u0, vt));
+elseif ~isempty(str2double(e_g0))
+    eg = str2double(e_g0);
+    al = 2.7;
+    p1 = eg*(tanh((x+a+vt)/b)+1)/2+u_g0;
+    p2 = eg/2/b*(1-tanh((x+a+vt)/b).^2)/al;
+    g0 = p1-p2;
+%     figure; hold on;
+%     plot(x, p1); plot(x, p2); plot(x, g0);
+%     pause();
+%     close all;
 end
 end
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