Update 4 1 horizontal scalar field

4-1-horizontal-scalar-field.md

@@ -10,6 +10,8 @@ Open your data file(s), using _Open Data_ buttons on the _Home_ menu category of
 
 ##### 2. Load the temperature variable and show it on a layer.
 
+> For the terms & names of UI components, refer to [UI Components](3-1-ui-components)
+
 In order to visualize the distribution of the variable on a layer, you can either
 
 * click the _Add Horizontal Plane_ menu button on _Layer_ menu category, select options, and then click "OK", or