ONRR periodically will publish in the Federal Register a list of market centers. ONRR will monitor market activity and, if necessary, add to or modify the list of market centers and will publish such modifications in the Federal Register. ONRR will consider the following factors and conditions in specifying market centers:

(a) Points where ONRR-approved publications publish prices useful for index purposes;

(b) Markets served;

(c) Input from industry and others knowledgeable in crude oil marketing and transportation;

(d) Simplification; and

(e) Other relevant matters.