._site

fold more often.

diff --git a/sim.py b/sim.py
--- a/sim.py
+++ b/sim.py
@@ -154,7 +154,7 @@ def checkfold(target, prev, net, probabi
         return
     dofold(target, prev, net)
 
-def fold(net, num=10):
+def fold(net, num=100):
     """do num path foldings.
 
     :return: the lengths of all used routes."""
@@ -173,7 +173,6 @@ def fold(net, num=10):
             pnet = net[prev]
             checkfold(target, prev, net)
     return routelengths
-            
 
 def linklengths(net):
     """calculate the lengths of all links"""