 ---
 angular velocity
            lat.n    lon.e      rate (deg./m.y.
 BU  -nz    -22.548  -72.058  1.9304
  
 covariance matrix (rad2/m.y.2 e-10
    1854.5      18.3     -77.5
      18.3    3845.5    -353.4
     -77.5    -353.4    2132.6
  
