Fig. 13
From: Non-backtracking cycles: length spectrum theory and graph mining applications
NBD of daily and weekly Enron graphs. Top: data aggregated into daily graphs and compared to one arbitrarily chosen milestone (Sunday, July 15th, 2001). Weekends are shaded blue. The periodicity of weekly communications is recovered. Bottom: Data aggregated into weekly graphs and compared to the week starting on Monday January 1st, 2001. Most peaks in values of NBD corresponding to events occurring during the Enron scandal