Update 4 2 vertical scalar field

4-2-vertical-scalar-field.md

@@ -50,7 +50,7 @@ You can control the size and location of the plane by using _Rendering Pane_ onl
   2. double-click one of the corners of the plane, to reveal the control handles,
   3. drag the control handles to change the size and/or height. 
 
-![](img/4-1-1-control-handles.png)
+![](img/4-2-1-control-handles.png)
 
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