Update 4 5 isosurface

4-5-isosurface.md

@@ -40,7 +40,7 @@ Each menu button has drop-down submenu, where you can set various options for ea
 In _3D Slices_ visualization style, you have three slices -zonal/meridonal/horizontal slices- , and you can change the location of the slices along latitude/longitude/height respectively. An example is shown in the figure below. To do this, you do:
  1. Click the _Globe_ button to change from _Globe_ to _Map_ mode (since it's more convenient to control), 
  2. Double-click one of the corners of the slices, in order to reveal the handles of the slice, 
- 3. Drag the handle of the slice,
+ 3. Drag the handle of the slice along the coordinate axes,
  4. You may want to go back to _Globe_ mode. (_Globe_ button is at the bottom-right corner of the screen)
 
 ![](img/4-6-1-volume-slices.png)