Figure 4
From: Distributed KDC-Based Random Pairwise Key Establishment in Wireless Sensor Networks

The number of preloaded initial keys versus the number of preloaded root keys varying with different size of key group.
From: Distributed KDC-Based Random Pairwise Key Establishment in Wireless Sensor Networks
The number of preloaded initial keys versus the number of preloaded root keys varying with different size of key group.