Polish

Trajectories/trajectories.py

@@ -7,6 +7,9 @@ Input: the graph of segments produced by Graph-tool (in gt or graphml
 format). Output: trajectories as lists of segments and as lists of
 instantaneous eddies, in JSon files.
 
+By construction, the segments and the instantaneous eddies in each
+trajectory are in ascending order.
+
 """
 
 import graph_tool