What follows is an opinion from the Supreme Court of the United States. Your task is to identify the disposition of the case, that is, the treatment the Supreme Court accorded the court whose decision it reviewed. The information relevant to this variable may be found near the end of the summary that begins on the title page of each case, or preferably at the very end of the opinion of the Court. For cases in which the Court granted a motion to dismiss, consider "petition denied or appeal dismissed". There is "no disposition" if the Court denied a motion to dismiss.

Opinion:
FEDERAL ENERGY REGULATORY COMMISSION v. SHELL OIL CO. et al.
No. 77-1652.
Argued January 15, 1979
Decided February 22, 1979
Howard E. Shapiro argued the cause for petitioner in No. 77-1652 and respondent in No. 77-1654. With him on the briefs were Solicitor General McCree, Deputy Solicitor General Barnett, Richard A. Allen, and M. Frazier King, Jr. Charles E. Hill argued the cause and filed briefs for petitioner in No. 77-1654.
Thomas G. Johnson argued the cause for respondents in No. 77-1652. With him on the brief were David G. Stevenson, David M. Whitney, W. 0. Strong III, Richard F. Generelly, Alan Berlin, B. James McGraw, Edwin S. Nail, Justin R. Wolf, Thomas H. Burton, Robert C. Murray, David C. Henri, Arthur S. Berner, Richard G. Harris, William A. Sackmann, Tom P. Hamill, Robert D. Haworth, John L. Williford, Paul W. Hicks, Richard F. Remmers, James D. Olsen, W. B. Wagner, Jr., Pat F. Timmons, John A. Ramsey, Paul J. Broyles, Karen, A. Berndt, George C. Bond, and Kenneth L. Riedman, Jr. Stephen M. Hackerman, Charles M. Darling IV, John M. Young, and Michael B. Silva filed a brief for Tenneco Oil Co. et al., respondents in No. 77-1652. Edwin W. Edwards, Governor of Louisiana, William J. Guste, Jr., Attorney General, James R. Patton, Jr., David B. Robinson, and Harry E. Barsh, Jr., filed a brief for the State of Louisiana, respondent in No. 77-1652.
Together with No. 77-1654, Consumer Energy Council of America v. Federal Energy Regulatory Commission, also on certiorari to the same court.
Briefs of amici curiae urging reversal were filed by Robert J. Hobbs for the Action Alliance of Senior Citizens of Greater Philadelphia; by Frederick Moring for the Associated Gas Distributors; and by Charles F. Wheatley, Jr., for the United States Conference of Mayors et al.
Avrum M. Gross, Attorney General, Robert M. Maynard, Assistant Attorney General, and Robert H. Loeffler filed a brief for the State of Alaska as amicus curiae urging affirmance.
Per Curiam.
The judgment is affirmed by an equally divided Court.
Mr. Justice Stewart took no part in the consideration or decision of these cases.

Question: What is the disposition of the case, that is, the treatment the Supreme Court accorded the court whose decision it reviewed?

Choices:
stay, petition, or motion granted
affirmed (includes modified)
reversed
reversed and remanded
vacated and remanded
affirmed and reversed (or vacated) in part
affirmed and reversed (or vacated) in part and remanded
vacated
petition denied or appeal dismissed
certification to or from a lower court
no disposition

Answer: 1