Q:  What is the amplitude of each star's motion?  In other words,
           what is the maximum speed away from the systematic velocity
           for each star?


        The red star moves from +95 to -70 km/sec, so its amplitude is
         
              v(red)  =   0.5 * (95 - (-70)) km/sec  =  82 km/sec


        The black star moves from +80 to -56 km/sec, so its amplitude is

            v(black)  =   0.5 * (80 - (-56)) km/sec  =  68 km/sec
 


      (These values are reasonably close to the 83 and 66 km/sec measured
            by Fetherolf et al)