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t = In 1 for 0.5 < H(x) < 1.0 <br />(1.0 — H(x)) 2 <br />co= 2.515517 <br />cl = 0.802853 <br />C2 = 0.010328 <br />d1= 1.432788 <br />d2 = 0.189269 <br />d3 = 0.001308 <br />1 <br />0.9 <br />0.8 <br />0.7 <br />a <br />0.8 <br />0 0.6 <br />0.4 <br />U <br />0.3 <br />0.2 <br />0.1 <br />0 <br />0 2 4 6 8 -3 ,2 -1 0 1 2 <br />Fort Collins 3 month (JFM) preclpitatlon (in.) SPl <br />Figure 1: Cumulative probability transformation from the gamma (left) to standard normal <br />distribution (right). (Edwards and McKee, 1997) <br />3 <br />