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:
 
@@ -15,7 +16,8 @@ After opening data files, you can add layers to the 3D-image in the **Rendering
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     ![](img/3-3-1-edit-layer.png)
 
- 
+##### Viewing Data
+
 After adding a layer, such as *Horizontal Plane*, **Rendering Pane** displays data of the selected variable on the layer, **Layers Pane** displays the layer name, and **Actions Pane** displays the *Add layer* action entry.
 
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@@ -34,7 +36,7 @@ This new menu category contains two panels.
 Note that the name of the added menu category and its ribbon are displayed differently with different added layer. 
 
 
-##### Changing variable on current layer
+### 2. Changing variable on the current layer
 To display data of another variable on the current layer, you can select that variable in the list (on the **Variables Pane**) and:
 
 *  double-click on that variable; or 
@@ -42,7 +44,7 @@ To display data of another variable on the current layer, you can select that va
 *  right-click and select *Show on Current Layer*.
 
 
-### 2. Layers Management
+### 3. Layers Management
 
 **Layers Pane** displays the list of layers according to the adding order and shows layer information such as layer properties, style and layer grid. 
 
@@ -58,9 +60,6 @@ The *Layer Name* is created in the following format: %VARIABLE NAME% : %SECTION
 
 *  You can show or hide a layer on the **Rendering Pane** by checking or unchecking the *Show/Hide* checkbox.
 
-<p align="center">
-      ![](img/3-3-2-show-hide.png)
-
 *  You can show all layers or hide all layers in the list by clicking *Show All* or *Hide All* button on the control bar.
 
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@@ -72,9 +71,6 @@ The alternative way is to choose *Layer* menu category in **Menu Bar**. In *View
 
 *  You can close each layer in the list by click the *Close* button.
 
-<p align="center">
-      ![](img/3-3-2-close.png)
-
 *  You can close all layers by clicking *Close All* button on the control bar.
 
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