Generate parameters for dNormAddTri
1 2 3  | dNormAddTriParm(x1, x2, x3, coefLower = -5, coefUpper = 5, multLower = -1,
  multUpper = 1, muLower = -2, muUpper = 2, sigLower = 0.5,
  sigUpper = 2)
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