 ---
 angular velocity
            lat.n    lon.e      rate (deg./m.y.
 PM  -xx     31.351 -113.904  0.3171
  
 covariance matrix (rad2/m.y.2 e-10
    1787.8     -82.1     -11.0
     -82.1    2841.0      61.3
     -11.0      61.3    1935.5
  
