Is this a gross proceeds clause… Gross Proceeds at WellheadIt is agreed between the Lessor and Lessee that, notwithstanding any language herein to the contrary, royalties payable on gas and gaseous substances, including casinghead gas, shall be based upon the MMBTu value of unprocessed gas at the wellhead, free of all costs, charges or deductions of producing, treating, compressing, transporting and marketing said gas to such purchaser, which royalty, however, shall be subject to such…See More