Table of oil NER

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F represents the flow in production in energy sources, typically in the form of oil and natural gas (although occasionally electrical grid outputs) from an oil and gas field. E represents external energy inputs required for an oil and gas extraction project. X represents internal energy inputs for an oil and gas project (fuel from the production flow used to perpetuate the project). I represents indirect energy inputs required to maintain the E inputs into the process. W represents the wasted energy, usually in the form of flared products.