Update 3 3 open layer

3-3-open-layer.md

@@ -7,21 +7,23 @@ After opening data files, you can add layers to the 3D-image in the **Rendering
 1.  In **Menu Bar**, choose *Layer* menu category.
 1.  In *Add Layer* panel, click the corresponding button with the layer that you want to add.
 
+<p align="center">
     ![](img/3-3-1-add-layer.png)
 
 1.  In *Edit [Layer Name] Layer* dialog box, such as *Edit Horizontal Plane Layer*, select the variable you want to show in *Select Variable* panel, set the vertical altitude and map area of the layer in *Area and level to Display* panel and other options, and click *OK* button.
 
-
+<p align="center">
     ![](img/3-3-1-edit-layer.png)
 
-
  
 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.
 
+<p align="center">
 ![](img/3-3-1-add-layer-result.png)
 
 In addition, the program generates one more menu category corresponding to the added layer in **Menu Bar**, such as *Horizontal Plane* menu category. 
 
+<p align="center">
 ![](img/3-3-1-add-category.png)
 
 This new menu category contains two panels. 
@@ -44,6 +46,7 @@ To display data of another variable on the current layer, you can select that va
 
 **Layers Pane** displays the list of layers according to the adding order and shows layer information such as layer properties, style and layer grid. 
 
+<p align="center">
 ![](img/3-3-2-layers-pane.png)
 
 Each layer item in the list consists of *Show/Hide* checkbox, *Layer Name*, *Lock Time* and *Close* buttons.
@@ -55,31 +58,36 @@ 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.
 
-      ![](img/3-3-2-show-hide-all.png)
+<p align="center">
+![](img/3-3-2-show-hide-all.png)
 
-      The alternative way is to choose *Layer* menu category in **Menu Bar**. In *View* panel, click the *Show* button.
+The alternative way is to choose *Layer* menu category in **Menu Bar**. In *View* panel, click the *Show* button.
 
 ##### Closing layers
 
 *  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.
 
-      ![](img/3-3-2-close-all.png)
+<p align="center">
+![](img/3-3-2-close-all.png)
 
-      The alternative way is to choose *Layer* menu category in **Menu Bar**. In *View* panel, click the *Close* button.
+The alternative way is to choose *Layer* menu category in **Menu Bar**. In *View* panel, click the *Close* button.
 
 
 ##### Arranging layers
 
 You can click the *Automatic Z-Order* to set the rendering order of layers added to the **Rendering Pane** based on the distance between the viewpoint and the center position of the layer map area. 
 
+<p align="center">
 ![](img/3-3-2-arrange-layer.png)
 
 The *Background Map* and *Borderlines Map* layers are always rendered first.
@@ -92,20 +100,23 @@ The alternative way is to choose *Layer* menu category in **Menu Bar**. In *Laye
 
 *  You can save the layer list in the current 3-D image in **Rendering Pane** into a layer profile file by clicking *Save* button on the control bar.
 
-      ![](img/3-3-2-save.png)
+<p align="center">
+![](img/3-3-2-save.png)
 
-      The alternative way is to choose *Layer* menu category in **Menu Bar**. In *Layer Profile* panel, click the *Save* button.
+The alternative way is to choose *Layer* menu category in **Menu Bar**. In *Layer Profile* panel, click the *Save* button.
 
 *  You can load the saved layer list from the layer profile file by clicking *Open* button on the control bar.
 
-      ![](img/3-3-2-open.png)
+<p align="center">
+![](img/3-3-2-open.png)
 
-      The alternative way is to choose *Layer* menu category in **Menu Bar**. In *Layer Profile* panel, click the *Open* button.
+The alternative way is to choose *Layer* menu category in **Menu Bar**. In *Layer Profile* panel, click the *Open* button.
 
 ##### Right-click
 
 You can control and edit a layer by selecting that layer and right-click.
 
+<p align="center">
 ![](img/3-3-2-layers-right-click.png)