This determines if the shaded area is at the bottom or at the top of the curve, or always towards the zero-axis of the graph. The options are 'zero', 'bottom' or 'top'.
+
This determines if the shaded area is at the bottom or at the top of the curve, or always towards the zero-axis of the graph. The options are 'zero', 'bottom' or 'top'.
+ See Example 20 what these options look like.