[Keyword] HISTPERIOD [Default] 0.0 [Description] Where nn defines the length of historic period in years (entering 0.0 will cause the historic peaks to be ignored). Must be greater that the systematic period. [Valid Values] 
nn
n . n n n
n n n n
n n
G E N E R A L I Z E D W E I G H T E D S T A T I O N
Y E S N O
n n . n n
n n n . n n