Figure 1: Theoretical and simulation values of and from different values of the load increasing with the increasing of the number of normal queues. (a) is the total offered load increasing with the growth of the number of normal queues. (b) is the total offered load increasing with the growth of the arrival rate of . (c) is the total offered load increasing with the growth of the arrival rate of . (d) is the total offered load increasing with the growth of the service time of . (e) is the total offered load increasing with the growth of the service time of .