| 
            plwidth
          ( | width ); | 
Sets the pen width.
width
          (PLFLT
            The desired pen width.  If 
              
            is negative or the same as the previous value no action is taken.
            width
            
               should be interpreted as
            as the minimum valid pen width for the device.  The interpretation of positive
            width = 0.
            
               values is also device
            dependent.
          width
            
      Redacted form: plwidth(width)
    
This function is used in examples 1 and 2.