4-2-vertical-scalar-field.md

@@ -9,9 +9,9 @@ This guide can also be applied to the visualization of any scalar field on verti
 
 ##### 2. Load the temperature variable and show it on a layer.
 
-##### 3. Change the settings for color mapping (if necessary).
+##### 3. Change the settings for color mapping (optional).
 
-##### 4. Change the visualization settings - contour vs. raster (if necessary).
+##### 4. Change the visualization settings - contour vs. raster (optional).
 
 ##### 5. Adjust the location of the cross-sectional plane.