199 shell shows prime shells in red and other shells in green.  It is interesting to note where the exclusion lines of prime shells are subsumed by green exclusion lines.  In other words, when the exclusion line of a prime shell, which is red, coincides with the exclusion of a non-prime shell further out, whereupon it becomes green.  This is simply a concequence of the way that the computer generates the images.  You could imagine the original red line as lying, unseen, underneath the overlaying green line.  All exclusion lines extend to infinity, even if this is not shown on the diagrams.