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Output for product-form queuing networks:
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Model:
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     - Throughput (tput)
       Gives the throughput for a single-chain PFQN station.

     - Response Time (rtime)
       Gives the average response time of a single-chain PFQN station.

     - Queue Length (qlength)
       Gives the average queue length at a single-chain PFQN station.

     - Utilization (util)
       Gives the utilization for a single-chain PFQN station.


