They are two different things and there is no relation between them. NRT is the time needed to establish a connection, ART is the time from the end of a client request to the first byte of the target server's response. If you add the two values, you will get the overall response time if the monitored application. However, the point of this tool and the QoE module for NPM is to tell you whether it is the application or the network that is slow.
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