# 4 452 # Weighted smoothing spline fit # Ice core and Mauna Loa CO2 # 50% attenuation at 23.4968 ; REG = 100.000 # Time Smoothed data 1765.0 277.9514 1765.5 277.9652 1766.0 277.9797 1766.5 277.9949 1767.0 278.0108 1767.5 278.0275 1768.0 278.0448 1768.5 278.0628 1769.0 278.0816 1769.5 278.1011 1770.0 278.1213 1770.5 278.1423 1771.0 278.1640 1771.5 278.1864 1772.0 278.2096 1772.5 278.2335 1773.0 278.2581 1773.5 278.2835 1774.0 278.3097 1774.5 278.3366 1775.0 278.3642 1775.5 278.3927 1776.0 278.4218 1776.5 278.4518 1777.0 278.4825 1777.5 278.5140 1778.0 278.5463 1778.5 278.5793 1779.0 278.6132 1779.5 278.6478 1780.0 278.6832 1780.5 278.7194 1781.0 278.7564 1781.5 278.7942 1782.0 278.8327 1782.5 278.8721 1783.0 278.9123 1783.5 278.9533 1784.0 278.9951 1784.5 279.0378 1785.0 279.0812 1785.5 279.1255 1786.0 279.1706 1786.5 279.2165 1787.0 279.2633 1787.5 279.3109 1788.0 279.3593 1788.5 279.4085 1789.0 279.4586 1789.5 279.5096 1790.0 279.5614 1790.5 279.6140 1791.0 279.6676 1791.5 279.7219 1792.0 279.7772 1792.5 279.8332 1793.0 279.8902 1793.5 279.9480 1794.0 280.0067 1794.5 280.0662 1795.0 280.1266 1795.5 280.1878 1796.0 280.2499 1796.5 280.3129 1797.0 280.3767 1797.5 280.4414 1798.0 280.5069 1798.5 280.5732 1799.0 280.6401 1799.5 280.7077 1800.0 280.7759 1800.5 280.8447 1801.0 280.9139 1801.5 280.9836 1802.0 281.0537 1802.5 281.1241 1803.0 281.1948 1803.5 281.2657 1804.0 281.3369 1804.5 281.4081 1805.0 281.4794 1805.5 281.5508 1806.0 281.6221 1806.5 281.6933 1807.0 281.7644 1807.5 281.8354 1808.0 281.9060 1808.5 281.9764 1809.0 282.0465 1809.5 282.1161 1810.0 282.1853 1810.5 282.2540 1811.0 282.3222 1811.5 282.3897 1812.0 282.4566 1812.5 282.5228 1813.0 282.5882 1813.5 282.6528 1814.0 282.7166 1814.5 282.7794 1815.0 282.8412 1815.5 282.9021 1816.0 282.9619 1816.5 283.0205 1817.0 283.0779 1817.5 283.1343 1818.0 283.1896 1818.5 283.2438 1819.0 283.2971 1819.5 283.3495 1820.0 283.4011 1820.5 283.4519 1821.0 283.5020 1821.5 283.5513 1822.0 283.6001 1822.5 283.6483 1823.0 283.6959 1823.5 283.7432 1824.0 283.7900 1824.5 283.8365 1825.0 283.8827 1825.5 283.9286 1826.0 283.9745 1826.5 284.0201 1827.0 284.0658 1827.5 284.1115 1828.0 284.1573 1828.5 284.2032 1829.0 284.2494 1829.5 284.2958 1830.0 284.3426 1830.5 284.3898 1831.0 284.4375 1831.5 284.4857 1832.0 284.5346 1832.5 284.5842 1833.0 284.6345 1833.5 284.6856 1834.0 284.7376 1834.5 284.7906 1835.0 284.8445 1835.5 284.8995 1836.0 284.9557 1836.5 285.0131 1837.0 285.0718 1837.5 285.1318 1838.0 285.1932 1838.5 285.2561 1839.0 285.3206 1839.5 285.3866 1840.0 285.4543 1840.5 285.5233 1841.0 285.5936 1841.5 285.6647 1842.0 285.7366 1842.5 285.8088 1843.0 285.8812 1843.5 285.9535 1844.0 286.0255 1844.5 286.0971 1845.0 286.1683 1845.5 286.2390 1846.0 286.3091 1846.5 286.3786 1847.0 286.4475 1847.5 286.5157 1848.0 286.5831 1848.5 286.6498 1849.0 286.7157 1849.5 286.7808 1850.0 286.8451 1850.5 286.9087 1851.0 286.9714 1851.5 287.0332 1852.0 287.0943 1852.5 287.1544 1853.0 287.2138 1853.5 287.2722 1854.0 287.3298 1854.5 287.3865 1855.0 287.4423 1855.5 287.4972 1856.0 287.5515 1856.5 287.6052 1857.0 287.6583 1857.5 287.7111 1858.0 287.7635 1858.5 287.8158 1859.0 287.8680 1859.5 287.9202 1860.0 287.9725 1860.5 288.0250 1861.0 288.0778 1861.5 288.1310 1862.0 288.1848 1862.5 288.2392 1863.0 288.2942 1863.5 288.3501 1864.0 288.4070 1864.5 288.4648 1865.0 288.5238 1865.5 288.5840 1866.0 288.6455 1866.5 288.7084 1867.0 288.7726 1867.5 288.8382 1868.0 288.9053 1868.5 288.9737 1869.0 289.0437 1869.5 289.1151 1870.0 289.1880 1870.5 289.2624 1871.0 289.3384 1871.5 289.4160 1872.0 289.4954 1872.5 289.5764 1873.0 289.6592 1873.5 289.7439 1874.0 289.8304 1874.5 289.9188 1875.0 290.0092 1875.5 290.1014 1876.0 290.1957 1876.5 290.2918 1877.0 290.3899 1877.5 290.4898 1878.0 290.5917 1878.5 290.6954 1879.0 290.8010 1879.5 290.9083 1880.0 291.0174 1880.5 291.1281 1881.0 291.2405 1881.5 291.3543 1882.0 291.4697 1882.5 291.5864 1883.0 291.7044 1883.5 291.8237 1884.0 291.9442 1884.5 292.0658 1885.0 292.1885 1885.5 292.3122 1886.0 292.4368 1886.5 292.5622 1887.0 292.6884 1887.5 292.8154 1888.0 292.9430 1888.5 293.0711 1889.0 293.1996 1889.5 293.3284 1890.0 293.4572 1890.5 293.5860 1891.0 293.7147 1891.5 293.8430 1892.0 293.9709 1892.5 294.0982 1893.0 294.2247 1893.5 294.3504 1894.0 294.4751 1894.5 294.5987 1895.0 294.7210 1895.5 294.8422 1896.0 294.9626 1896.5 295.0822 1897.0 295.2014 1897.5 295.3202 1898.0 295.4390 1898.5 295.5578 1899.0 295.6769 1899.5 295.7964 1900.0 295.9167 1900.5 296.0378 1901.0 296.1599 1901.5 296.2834 1902.0 296.4082 1902.5 296.5348 1903.0 296.6631 1903.5 296.7935 1904.0 296.9261 1904.5 297.0609 1905.0 297.1977 1905.5 297.3365 1906.0 297.4772 1906.5 297.6196 1907.0 297.7637 1907.5 297.9093 1908.0 298.0562 1908.5 298.2043 1909.0 298.3535 1909.5 298.5036 1910.0 298.6545 1910.5 298.8061 1911.0 298.9584 1911.5 299.1113 1912.0 299.2648 1912.5 299.4189 1913.0 299.5734 1913.5 299.7285 1914.0 299.8839 1914.5 300.0397 1915.0 300.1958 1915.5 300.3522 1916.0 300.5088 1916.5 300.6656 1917.0 300.8225 1917.5 300.9796 1918.0 301.1368 1918.5 301.2941 1919.0 301.4514 1919.5 301.6087 1920.0 301.7659 1920.5 301.9232 1921.0 302.0803 1921.5 302.2373 1922.0 302.3942 1922.5 302.5508 1923.0 302.7071 1923.5 302.8628 1924.0 303.0179 1924.5 303.1723 1925.0 303.3258 1925.5 303.4783 1926.0 303.6298 1926.5 303.7800 1927.0 303.9290 1927.5 304.0764 1928.0 304.2224 1928.5 304.3668 1929.0 304.5098 1929.5 304.6515 1930.0 304.7920 1930.5 304.9312 1931.0 305.0694 1931.5 305.2066 1932.0 305.3428 1932.5 305.4782 1933.0 305.6128 1933.5 305.7468 1934.0 305.8803 1934.5 306.0135 1935.0 306.1465 1935.5 306.2795 1936.0 306.4126 1936.5 306.5461 1937.0 306.6801 1937.5 306.8148 1938.0 306.9503 1938.5 307.0871 1939.0 307.2251 1939.5 307.3647 1940.0 307.5059 1940.5 307.6490 1941.0 307.7943 1941.5 307.9417 1942.0 308.0917 1942.5 308.2444 1943.0 308.3999 1943.5 308.5586 1944.0 308.7204 1944.5 308.8857 1945.0 309.0544 1945.5 309.2267 1946.0 309.4026 1946.5 309.5824 1947.0 309.7661 1947.5 309.9538 1948.0 310.1455 1948.5 310.3415 1949.0 310.5418 1949.5 310.7465 1950.0 310.9557 1950.5 311.1696 1951.0 311.3883 1951.5 311.6119 1952.0 311.8406 1952.5 312.0746 1953.0 312.3139 1953.5 312.5587 1954.0 312.8091 1954.5 313.0653 1955.0 313.3275 1955.5 313.5958 1956.0 313.8704 1956.5 314.1514 1957.0 314.4390 1957.5 314.7334 1958.0 315.0347 1958.5 315.3430 1959.0 315.6585 1959.5 315.9810 1960.0 316.3099 1960.5 316.6444 1961.0 316.9835 1961.5 317.3266 1962.0 317.6732 1962.5 318.0236 1963.0 318.3782 1963.5 318.7385 1964.0 319.1062 1964.5 319.4833 1965.0 319.8721 1965.5 320.2745 1966.0 320.6922 1966.5 321.1253 1967.0 321.5737 1967.5 322.0377 1968.0 322.5174 1968.5 323.0131 1969.0 323.5248 1969.5 324.0520 1970.0 324.5937 1970.5 325.1487 1971.0 325.7158 1971.5 326.2941 1972.0 326.8828 1972.5 327.4806 1973.0 328.0859 1973.5 328.6966 1974.0 329.3108 1974.5 329.9296 1975.0 330.5549 1975.5 331.1889 1976.0 331.8340 1976.5 332.4917 1977.0 333.1631 1977.5 333.8474 1978.0 334.5436 1978.5 335.2500 1979.0 335.9649 1979.5 336.6871 1980.0 337.4153 1980.5 338.1481 1981.0 338.8848 1981.5 339.6254 1982.0 340.3708 1982.5 341.1221 1983.0 341.8802 1983.5 342.6460 1984.0 343.4197 1984.5 344.2017 1985.0 344.9922 1985.5 345.7917 1986.0 346.6006 1986.5 347.4193 1987.0 348.2476 1987.5 349.0837 1988.0 349.9257 1988.5 350.7702 1989.0 351.6200 1989.5 352.4700 1990.0 353.3200 1990.5 354.1700 1991.0 354.9666 1991.5 355.4840 1992.0 355.9125 1992.5 356.2656 1993.0 356.4832 1993.5 356.9545 1994.0 357.6902 1994.5 358.6209 1995.0 359.6369 1995.5 360.6260 1996.0 361.5229 1996.5 362.3600 1997.0 362.8839 1997.5 363.4538 1998.0 364.7527 1998.5 366.5040 1999.0 367.6363 1999.5 368.1512 2000.0 368.5849 2000.5 369.4103 2001.0 370.3523 2001.5 371.0773 2002.0 371.9717 2002.5 373.1636 2003.0 374.4362