Update 3 3 open layer

3-3-open-layer.md

 # Viewing data with layers (and how to use Layers Pane)
 
+### 1. Adding layers and viewing data
+##### Adding layers
+After opening data files, you can add layers to the 3D-image in the **Rendering Pane** as follows:
+
+1.  In **Menu Bar**, choose *Layer* category.
+1.  In *Add Layer* panel, click the corresponding button with the layer that you want to add.
+
+    ![](img/3-3-1-add-layer.png)
+
+1.  In *Edit [Layer Name] Layer* dialog box, such as *Edit Horizontal Plane Layer*, customize your layer and click *OK* button.
+
+    ![](img/3-3-1-edit-layer.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:
+
+*  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*.
+
+
+### 2. Layers Management
 
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