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 Purpose : Calculates the minimum and maximum value of a PES
 Usage   : maxpe [-h -ver ] name-directory
 Generate an oper file for an exact calculation and then run
  maxpe with the path to that directory as argument.

 -ver    : Version information about the program 
 -h      : Print this help text 
NB: The routine vminmax is a more powerful alternative which
does not require an operator in exact, but in pes format
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