Expected upper limits, using the B (alternate) model : 
expected limit (median)
13.199821378698793
expected limit (-1 sig)
9.658687179425739
expected limit (+1 sig)
16.394260223447418
expected limit (-2 sig)
7.6540793960391635
expected limit (+2 sig)
25.56014184416209
--------------------------------------------
The observed CLs upper limit is:
18.77324894862969
