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        PICScript abs( )
        abs (expression)
        
            - Returns the absolute value of an expression. The 
 result is always a positive number.
 
            - This function may be used in horizon math or grid 
 math scripts.
 
            - Must be used inside a function block func 
 {}.
 
        
        Example:
        time = abs (upper – lower);
         
        PICScript 
 Functions)