| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a process control loop including a device that determines the presence of and sources of instabilities within a process control loop or device; Figs. 2A and 2B are graphs of a travel signal, a command signal and a net actuator pressure signal versus time for a system undergoing instabilities; Figs. 3A and 3B are graphs of a travel sign
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