 Reading) and frames defined by a loaded 
               frame kernel (FK). 
 
               When `ref' designates a non-inertial frame, the 
               orientation of the frame is evaluated at an epoch 
               dependent on the selected aberration correction. See 
               the description of the output position vector `ptarg' 
               for details. 
 
   abcorr      indicates the aberration corrections to be applied to 
               the position of the target body to account for 
