Update 3 2 open data

3-2-open-data.md

@@ -11,7 +11,7 @@ To open a file or a directory containing multiple files:
 
 ### 2. Using *Variables Pane* to manage variables.
 
-After opening data files, the **Variables Pane** displays a hierarchical tree structure (*File Name* -> *Category Name* or *Vertical Coordinate System* -> *Variable Name*) of the variables in your data. 
+The **Variables Pane** consists of two components: control bar and display area. After opening data files, the **Variables Pane** displays a hierarchical tree structure (*File Name* -> *Category Name* or *Vertical Coordinate System* -> *Variable Name*) of the variables in your data. 
 
 ![](img/3-2-2-variables-pane.png)
 
@@ -41,7 +41,7 @@ By default, the variables are grouped by category and displayed with ID. You can
 
 ##### Speed up by right-click
 
-To customize variables in a data file, select the file name and right-click, then choose the options.
+To customize options for displaying variables in a data file, select the file name and right-click, then choose the options.
 
 ![](img/3-2-2-variables-right-click.png)