lesson-4.md

@@ -79,9 +79,14 @@ This exercise combines the previous two exercises to both follow a black line on
 
 
 ##### Creating the track #####
-We started off by finding a circular track with a black line on white background. On this track, we placed a light green post it note to indicate the goal zone. An interesting observation here is that the light green color is different to the dark green color which was used in previous exercises. This causes the sensor to make different readings.
+We started off by finding a circular track with a black line on white background. On this track, we placed a light green post it note to indicate the goal zone. An interesting observation here is that the light green color is different to the dark green color which was used in previous exercises. This causes the sensor to register different readings.
 
+##### Changing the sensor height #####
+We made some readings with this light green color and found the results seen in table <<<table ref >>>>>.
 
+**White** | **Black** | **Dark green** | **Light green**
+--- | --- | --- | ---
+51% | 33% | 37% | 40%
 ### PID Line Follower ###
 
 #### Description ####