bar_legend.xml

<mugl>
  <legend visible="true" opacity="1"/>
  <background color="0xcccccc"/>
  <window margin="0" padding="5" border="5" bordercolor="0x000000"/>
  <plotarea margintop="10" marginleft="38" marginbottom="35" marginright="35"/>
  <horizontalaxis id="x" min="1900" max="2000" length="1" base="-1,-1" anchor="-1" />
  <verticalaxis   id="y"  min="-1" max="1" length="1"/>
  <plot>
    <horizontalaxis ref="x">
      <variable ref="x"/>
    </horizontalaxis>
    <verticalaxis ref="y">
      <variable ref="y"/>
    </verticalaxis>
    <renderer type="bar">
      <option name="linecolor" value="0xff00ff"/>
      <option name="fillcolor" value="0x00ff00"/>
      <option name="barwidth" value="1"/>
      <option name="baroffset" value="0"/>
      <option name="hidelines" value="2"/>
      <option name="barbase" value="-.7"/>
    </renderer>
  </plot>
  <data>
    <variables>
      <variable column="0" id="x"/>
      <variable column="1" id="y" missingvalue="-9000" missingop="le"/>
    </variables>
    <values>
      1900,-0.710738
      1901,-0.709837
      1902,-0.738885
      1903,-0.822017
      1904,-0.828376
      1905,-0.748973
      1906,-0.670167
      1907,-0.717963
      1908,-0.757014
      1909,-0.742775
      1910,-9000
      1911,-9000
      1912,-9000
      1913,-9000
      1914,-0.709540
      1915,-0.666296
      1916,-0.615051
      1917,-0.681798
      1918,-0.653037
      1919,-0.594194
      1920,-0.657729
      1921,-0.661296
      1922,-0.633630
      1923,-0.596698
      1924,-0.601313
      1925,-0.609820
      1926,-0.635884
      1927,-0.623605
      1928,-0.559513
      1929,-0.598222
      1930,-0.652624
      1931,-0.632389
      1932,-0.624553
      1933,-0.609135
      1934,-0.602625
      1935,-0.566810
      1936,-0.552560
      1937,-0.584782
      1938,-0.576507
      1939,-0.518921
      1940,-9000
      1941,-9000
      1942,-0.520879
      1943,-0.541142
      1944,-0.535743
      1945,-0.471457
      1946,-0.511557
      1947,-0.533288
      1948,-0.521996
      1949,-0.569460
      1950,-0.486723
      1951,-0.458477
      1952,-0.536644
      1953,-0.453351
      1954,-0.444120
      1955,-0.480438
      1956,-0.453878
      1957,-0.421881
      1958,-0.463311
      1959,-0.395277
      1960,-0.440320
      1961,-0.461807
      1962,-0.461378
      1963,-0.453368
      1964,-0.495349
      1965,-0.476183
      1966,-0.453868
      1967,-0.400522
      1968,-0.375041
      1969,-0.400482
      1970,-9000
      1971,-9000
      1972,-9000
      1973,-9000
      1974,-9000
      1975,-9000
      1976,-9000
      1977,-9000
      1978,-9000
      1979,-9000
      1980,-9000
      1981,-0.104629
      1982,-0.163454
      1983,-0.265794
      1984,-0.199850
      1985,-0.118408
      1986,-0.088032
      1987,-0.027990
      1988,-0.048658
      1989,-0.012725
      1990,0.024057
      1991,0.015163
      1992,-0.206681
      1993,-0.108136
      1994,-0.009449
      1995,-0.004492
      1996,0.054049
      1997,0.075091
      1998,0.120801
      1999,0.137926
      2000,0.166130
    </values>
  </data>
</mugl>