Update 4 3 horizontal vector field

4-3-horizontal-vector-field.md

@@ -5,7 +5,7 @@
 ![](img/4-3-horizontal-vector-field.png)
 
 > NOTE:  
-> In order to visualize wind speed, you need both u and v components of wind vectors in your dataset.  
+> In order to visualize wind vectors, you need both u and v components of wind vectors in your dataset.  
 > For the terms & names of UI components, refer to _[UI Components](3-1-ui-components)_.
 
 ##### 1. Open data file.