hoice.

               'abcorr' may be any of the following:

                  'NONE'     Apply no correction. Return the
                             geometric surface intercept point on the
                             target body.

               Let 'lt' represent the one-way light time between the
               observer and the surface intercept point (note: NOT
               between the observer and the target body's center).
               The following values of 'abcorr' apply to the
            