| An argument that takes a true/false value.    The argument should be 0 or 1.  The option is output to gnuplot as
    truevalif the argument is true orfalsevalif the argument is
    false.  Either one can beNone, in which case nothing is output.defaultshould also be 0 or 1. 
        
            | Methods |  |  
        | __call__ __init__
 
 |  
            |  | __call__ |  
        | 
__call__ ( self,  keyw )
 |  
            |  | __init__ |  
        | 
__init__ (
        self,
        argname,
        trueval,
        falseval,
        fixedword=None,
        default=None,
        )
 |  |