What follows is an opinion from a United States Court of Appeals. Your task is to identify the federal agency (if any) whose decision was reviewed by the court of appeals. If there was no prior agency action, choose "not applicable".

Opinion:
Billy J. McCOMBS, R. James Stillings, d/b/a Gastill Company, David A. Ons-gard, Basin Petroleum Corporation, and Bill Forney, Petitioners, v. FEDERAL ENERGY REGULATORY COMMISSION, Respondent. United Gas Pipe Line Company, Intervenor.
No. 75-1829.
United States Court of Appeals, Tenth Circuit.
March 31, 1983.
Before SETH, Chief Judge, HOLLOWAY, McWilliams, barrett, wil-liam E. DOYLE, McKAY, LOGAN and SEYMOUR, Circuit Judges.
ORDER
This matter comes on for consideration of the joint motion of petitioners and interve-nor in the captioned cause for an order vacating and withdrawing the court’s opinion of November 7, 1980, 705 F.2d 1177, and motion to dismiss.
Upon consideration whereof:
1. The opinion of the court filed November 7, 1980, and the dissenting opinion of Judge Holloway are withdrawn.
2. The judgment entered by this court in the captioned appeal on November 7, 1980, is hereby vacated.
3. The captioned cause is dismissed. Each party shall bear its own costs.

Question: What federal agency's decision was reviewed by the court of appeals?

Choices:
Benefits Review Board
Civil Aeronautics Board
Civil Service Commission
Federal Communications Commission
Federal Energy Regulatory Commission
Federal Power Commission
Federal Maritime Commission
Federal Trade Commission
Interstate Commerce Commission
National Labor Relations Board
Atomic Energy Commission
Nuclear Regulatory Commission
Securities & Exchange Commission
Other federal agency
Not ascertained or not applicable

Answer: 14