Update 3 2 open data

3-2-open-data.md

@@ -11,11 +11,13 @@ To open a file or a directory containing multiple files:
 
 ### 2. Using Variables Pane.
 
-After opening data files, the *Variables Pane* displays a hierarchical tree structure of the variables in your data. 
+After opening data files, the *Variables Pane* displays a hierarchical tree structure (*File Name* -> *Category Name* or *Vertical Coordinate System* -> *Variables*) of the variables in your data. 
 
 ![](img/3-2-2-variables-pane.png)
 
-By default, the variables are grouped by category and displayed with ID. You can customize the options to display variables by clicking buttons on the control bar of *Variables Pane* as follows:
+By default, the variables are grouped by category and displayed with ID. You can customize the options to display variables as follows:
+
+##### Click buttons on the control bar
 
 *  You can group variables by clicking *Grouping* button.
 
@@ -29,10 +31,22 @@ By default, the variables are grouped by category and displayed with ID. You can
 
 ![](img/3-2-2-variables-filtering.png)
 
+*  You can click the *Arrange By Name* button to arrange variables by their name (with *A to Z* order).
+
+![](img/3-2-2-variables-arrange.png)
+
+* If you want to close a data file, select that data file by click the file name on variable list, then click the *Close Dataset* button, then click *OK* button on the dialog box.
+
+![](img/3-2-2-variables-close.png)
+
+##### Speed up by right-click
 
+To customize variables in a data file, select the *File Name* and right-click, then choose the options.
 
+![](img/3-2-2-variables-right-click.png)
 
 
+ 
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