Update 4 1 horizontal scalar field

4-1-horizontal-scalar-field.md

@@ -27,7 +27,7 @@ If your dataset includes wind flow datasets at multiple altitude, you can select
 On _Horizontal Plane_ menu category of _Menu Bar_, you will find _Vertical Level_ drop-down control, where you can select height level among all the levels available in your dataset. You can also click _Move Up / Move Down_ button in order to increase / decrease the selected level.
 
 You can also change the location of the horizontal plane using _Rendering Pane_ only.
-Double-click one of the corners of the plane on _Rendering Pane_ in order to reveal handles, and then drag the handles to move the plane around.
+Double-click one of the corners of the plane on _Rendering Pane_ in order to reveal handles, and then just drag the handles to move the plane around.
 
 ##### 4. Change the settings for color mapping (optional).