Thanks for the additional document, that clears things up. You are correct in that the fractional NPRI reduces the royalty in the lease owned by the mineral owners, but the 13/16 is going to be burdening in the same way ie 7/48 (48/48 - 1/24 - 13/16) royalty was conveyed with the minerals. See the language in the deed ‘the remaining royalty, their ownership also being non-participating.’ So Forse picked up a 1/6 * 7/48 interest. Was there another deed before the redacted deed? Red must have split Forse’s interest with someone, and then conveyed ART to 1/2 * 1/6 * 7/48.