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<br />-6 <br />1890 <br /> <br />1910 <br /> <br />1930 1950 <br />Year <br /> <br />1970 <br /> <br />1990 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br /> <br />o <br /> <br /> <br />4 <br /> <br />2 <br /> <br />C <br />::t: <br />Q. <br /> <br />-2 <br /> <br />-4 <br /> <br />rJgUTe 4.10 Plot of area-averaged annual Palmer Hydrological Drought Index (PHDI) values <br />with 5-year running means. <br /> <br />4-16 <br />