(Emphasis added.) More simply, as important to the issues before us, Chesapeake would retain for each well the acreage “included within the proration . . . unit” “prescribed by field rules” or, “absen ...

As explained, however, Endeavor had previously filed plats with the Commission assigning proration units of only 81.21 or 81.0 acres to each of the four wells, and those proration units did not ...