It is a 13:1 system.
The funny thing is: some people told me that the "8:1" cascaded systems are easier to sheet than the 8:1 conventional systems. Well, of course they are, since they are actually 9:1.
Well the claim is still true when both are true 8:1 systems. There is just less friction in the system. A similar effect can be had by tapering the sheet. And that is what many are using now over cascaded systems. Cascades are still often used as downhaul systems as tapering is less practical here.
Wouter
