function [t,xn,xs,en,es,scale]=cfc12atmhist98;
% CFC12ATMHIST98 Atmospheric history for CFC12 on SIO-1998 calibration scale
%
% [T,XN,XS,EN,ES,SCALE]=CFC12ATMHIST98 Returns columnn vectors of:
% T  = Time (mid year)
% XN = Mixing ratio in N. hemisphere [ppt]
% XS = Mixing ratio in S. hemisphere [ppt]
% EN = Uncertainty in N. hemisphere mixing ratio [ppt]
% ES = Uncertainty in S. hemisphere mixing ratio [ppt]
% SCALE = Name of calibration scale against which measurements were made
%
% All concentrations are on the SIO-1998 calibration scale
%
% Atmospheric lifetime assumed to be 100.0 years
%
% Walker, S. J., R. F. Weiss and P. K. Salameh, Reconstructed histories of
%         the annual mean atmospheric mole fractions for the halocarbons
%         CFC-11, CFC-12, CFC-113 and carbon tetrachloride. Journal of 
%         Geophysical Research, 105, C6, 14,285-14,296, 2000
%
% This file obtained from:
%
%  http://gaslab.ucsd.edu/pub/cfchist/ 
%  Created: 19-July-2004
%
%   Stephen J. Walker 
%   Scripps Institution of Oceanography

%
%      Northern        Southern
% Year Value Error  Value  Error
%      [ppt] [ppt]  [ppt]  [ppt]
%  (1)  (2)   (3)    (4)    (5)
%
scale='SIO-1998';
data=[
 1931.5   0.0  0.0    0.0  0.0
 1932.5   0.0  0.0    0.0  0.0
 1933.5   0.0  0.0    0.0  0.0
 1934.5   0.0  0.0    0.0  0.0
 1935.5   0.0  0.0    0.0  0.0
 1936.5   0.1  0.0    0.0  0.0
 1937.5   0.1  0.0    0.1  0.0
 1938.5   0.2  0.0    0.1  0.0
 1939.5   0.3  0.0    0.2  0.0
 1940.5   0.4  0.0    0.3  0.0
 1941.5   0.5  0.0    0.4  0.0
 1942.5   0.7  0.0    0.5  0.0
 1943.5   0.9  0.0    0.7  0.0
 1944.5   1.2  0.0    0.9  0.0
 1945.5   1.7  0.0    1.2  0.0
 1946.5   2.3  0.1    1.7  0.0
 1947.5   3.4  0.1    2.4  0.1
 1948.5   4.8  0.1    3.4  0.1
 1949.5   6.1  0.1    4.7  0.1
 1950.5   7.6  0.2    6.0  0.1
 1951.5   9.2  0.2    7.4  0.2
 1952.5  11.0  0.3    9.0  0.2
 1953.5  12.8  0.3   10.7  0.3
 1954.5  15.0  0.3   12.6  0.3
 1955.5  17.4  0.4   14.7  0.3
 1956.5  20.2  0.4   17.1  0.4
 1957.5  23.4  0.5   19.9  0.5
 1958.5  26.8  0.6   23.0  0.5
 1959.5  30.5  0.7   26.3  0.6
 1960.5  35.0  0.7   30.1  0.7
 1961.5  40.0  0.9   34.4  0.8
 1962.5  45.8  1.0   39.4  0.9
 1963.5  52.5  1.1   45.1  1.0
 1964.5  60.4  1.3   51.8  1.2
 1965.5  69.3  1.4   59.5  1.3
 1966.5  79.2  1.7   68.1  1.5
 1967.5  90.3  1.9   77.9  1.7
 1968.5 102.8  2.1   88.8  2.0
 1969.5 116.7  2.4  101.0  2.2
 1970.5 132.0  2.7  114.7  2.5
 1971.5 148.3  3.0  129.6  2.9
 1972.5 166.1  3.4  145.6  3.2
 1973.5 185.7  3.8  163.2  3.6
 1974.5 207.1  4.2  182.5  4.0
 1975.5 228.1  4.5  202.9  4.4
 1976.5 248.0  4.8  223.1  4.8
 1977.5 266.9  5.0  242.6  5.1
 1978.5 284.2  5.3  261.1  5.4
 1979.5 305.9  2.7  273.5  2.1
 1980.5 323.0  3.9  292.3  1.8
 1981.5 339.6  3.2  308.8  2.3
 1982.5 353.3  4.5  325.5  1.8
 1983.5 369.0  5.5  342.5  2.1
 1984.5 385.7  2.8  359.4  2.1
 1985.5 403.4  2.4  378.2  2.0
 1986.5 424.3  3.8  396.5  2.6
 1987.5 444.0  4.1  416.3  3.2
 1988.5 465.4  2.8  435.8  2.8
 1989.5 483.6  3.0  454.4  2.1
 1990.5 497.7  2.8  472.7  2.1
 1991.5 506.0  3.1  487.4  2.4
 1992.5 516.4  2.3  498.4  2.3
 1993.5 523.2  1.5  507.0  1.7
 1994.5 528.9  1.4  514.7  0.3
 1995.5 533.9  0.5  520.9  0.3
 1996.5 537.6  0.5  526.2  0.4
 1997.5 540.5  0.4  530.6  0.2
 1998.5 542.5  0.4  533.8  0.2
 1999.5 544.1  0.6  536.7  0.4
 2000.5 546.4  0.4  539.2  0.3
 2001.5 546.9  0.4  540.4  0.3
 2002.5 546.8  0.4  541.3  0.3
 2003.5 546.5  0.4  541.7  0.3
];
t =data(:,1);
xn=data(:,2);
en=data(:,3);
xs=data(:,4);
es=data(:,5);