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To what degree do the following parameter affect or influence the Net Dependable Capacity (NDC MW output) of a typical gas turbine engine (say GE Frame 6): The ambient temperature, ambient pressure, ambient relative humidity, water injection rate, system frequency, power factor, voltage, fuel properties and gas turbine fired hours? How can I approximate or account for these factors to correct back the operational output at a given condition to performance basis condition of the machine? Is there a practical formula relating these factors?