 ---
 angular velocity
            lat.n    lon.e      rate (deg./m.y.
 BU  -NB      7.560  -72.665  2.7978
  
 covariance matrix (rad2/m.y.2 e-10
    3283.1    -271.1      49.7
    -271.1    4050.7     130.4
      49.7     130.4    3366.7
  
