Update 3 3 open layer

3-3-open-layer.md

@@ -14,19 +14,28 @@ After opening data files, you can add layers to the 3D-image in the **Rendering
     ![](img/3-3-1-edit-layer.png)
 
  
-After adding a layer, the program adds one more category corresponding to added layer in *Menu Category*, such as *Horizontal Plane* category. Note that the name of the added category and its ribbon are displayed differently with different added layer.
+After adding a layer, the program adds one more category corresponding to the added layer in *Menu Category*, such as *Horizontal Plane* category. This new category contains two panels. 
+
+*  *Grid Options* panel contains buttons used to set the properties of the layer grid data to extract from the numerical model data.
+*  *Style* panel contains buttons used to set the display properties of the added layer.
+
+Note that the name of the added category and its ribbon are displayed differently with different added layer. 
 
 ![](img/3-3-1-add-category.png)
 
 
 
 ##### Viewing data
-To display the data of a variable on the current layer, on the **Variables Pane**, you can select that variable in the list and:
+To display the data of a variable on the current layer, you can *select* that variable in the list (on the **Variables Pane**) and:
 
 *  double-click on that variable; or 
 *  click the first button on the control bar, then select *Show on Current Layer*; or
 *  right-click and select *Show on Current Layer*.
 
+Note that when you add a layer, data of a variable is displayed. You can change the 
+
+
+
 
 ### 2. Layers Management