Update 4 3 horizontal vector field

4-3-horizontal-vector-field.md

@@ -46,7 +46,7 @@ On _Horizontal Plane_ menu category of _Menu Bar_, you will find _Vertical Level
 You can control the size and location of the plane by using _Rendering Pane_ only. To do this, you do :
   1. switch from _Globe_ mode to _Map_ mode,
   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. 
+  3. drag the control handles to change the size and/or height of the plane. 
 
 
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