54.3. If natural gas is transported by pipeline to a straddle plant at which natural gas liquids or ethane (each of which is referred to in this section as “natural gas liquids”) is recovered from the natural gas, the residue gas is returned to the pipeline after the recovery along with other natural gas (in this section referred to as “make-up gas”) that is supplied solely to make up for the loss of energy content due to the recovery, and the consideration or a part of the consideration for any supply of the natural gas liquids, or the right to recover the liquids, or any supply of make-up gas is, in the case of a supply of natural gas liquids or the right to recover the liquids, the make-up gas, and, in the case of a supply of make-up gas, the natural gas liquids or the right to recover the liquids, the value of that consideration or part, as the case may be, is deemed to be nil.