Update 4 3 horizontal vector field

4-3-horizontal-vector-field.md

@@ -15,7 +15,7 @@ In order to visualize the distribution of the variable on a layer, you can eithe
 * click the _Add Vector Plane_ menu button on _Layer_ menu category, select variable/area/level etc, and then click "OK", or 
 * right-click one of u/v components of wind on the _Variables Pane_, select _'Add Vector Plane'_. 
 
-_Rendering Pane_ will immediately display the vector field of wind, and a new layer will be added to the _Layers Pane_. By default, wind flow will be shown using arrows at each grid points.
+_Rendering Pane_ will immediately display the vector field of wind, and a new layer will be added to the _Layers Pane_. By default, wind flow will be shown using wind vectors (arrows) at each grid points.
 
 ##### 3. Explore wind flow at different altitudes (if any).