Update 3 3 open layer

3-3-open-layer.md

@@ -7,7 +7,7 @@ After opening data files, you can add layers to the 3D-image in the **Rendering
 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)
+                         ![](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.