Q:  What is the amplitude of the side-to-side motion around
              the diagonal straight line?  The units on both
              axes are milli-arcseconds.

          The shift has an amplitude of roughly 120 milli-arcseconds



  Q:  What is the amplitude of the parallax motion of this star,
              expressed in arcseconds?

          That corresponds to about 0.120 arcseconds.



  Q:  What is the distance to this star, expressed in parsecs?

          The distance is therefore

                         1
            d  =  ---------------     =  about 8 parsecs
                   0.120 arcsec