 ---
 angular velocity
            lat.n    lon.e      rate (deg./m.y.
 NI  -nb     -6.874 -177.705  3.3922
  
 covariance matrix (rad2/m.y.2 e-10
    3639.7     -26.1      31.4
     -26.1    4123.4      -8.2
      31.4      -8.2    3859.1
  
