REVISION DATE: 13-Apr-2016 11:51:36

Looking at the amount of darks between the tracks. This is with all tracks on so there is going to me more than when only one or alternate tracks are on.

The Dark pixesl selected are = [73 149 223 296 369 441 513 585 657 728 801 874 951]. So the are to the left of the track they are divided by.

Figure 1