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Parameter 'distribution'
A three-character code indicating the distribution family. Must be "GUM", "NOR", "LNO", "GEV", "GLO", "GNO", "PE3", "LP3", or "WEI".
"GUM"
"NOR"
"LNO"
"GEV"
"GLO"
"GNO"
"PE3"
"LP3"
"WEI"