Fixed bug 'plot_type' not found.

The variable 'plot_type' was changed to 'stem'.

examples/example00.py

@@ -45,7 +45,8 @@ for d in densities:
     # compute the corresponding averaged radius (in Bohr units)
     rs = ( (1/d) / ((4/3) * np.pi) ) ** (1/3) / a0
     # Some output printing
-    print("Computing {} for RS={}".format(plot_type, rs))
+    stem = 'plas_disp'
+    print("Computing {} for RS={}".format(stem, rs))
     # Here is the actual call to calculate
     data = compute(N_Q=100, RS=rs, T=T)
     # 'data' is a dict, each key is the name of an output file (without extansion).
@@ -53,7 +54,7 @@ for d in densities:
     # the number of points chosen and on the kind of output file.
 
     # Reading data
-    X, Y = data['plas_disp'].T
+    X, Y = data[stem].T
     # Plotting
     plt.plot(X, Y, label=r'density={:.2e} $e/cm^3$'.format(d))