This form is used when the parties own undivided leasehold interests in the Lease as to depths from the surface of the ground to a Specific Depth. The parties acknowledge that the production from a well on the leasehold interest will be obtained from depths in which the ownership is not common. Thus, the parties find it necessary to enter into this Agreement to enable the parties to each be paid a proportionate part of the commingled production from the separate depths in which they own interests.