Q:  How large should the claimed motion of Barnard's Star
        appear on this graph?


    A:  The claimed motions are 9.3 and 5.3 milli-arcsec.  This graph
            of measurements from HST has position of the star
            in units of milli-arcsec on the y-axis.  So, if the motions
            were real, then they would cause sinusoidal wiggles
            from the top to the bottom of the graph over this five-year
            period.

            But we don't see any smooth wiggles of that size on the graph.
            Just random noise.
 
            So the motions aren't real -- and the planets around Barnard's
            Star don't exist.