This directory contains the Appendix extracted from                           
                                                                              
          Brace, L. H. and A. J. Kliore, "Structure of the Venus              
          Ionosphere", Space Science Reviews, v55, p81-163, 1991.             
                                                                              
which describes some of the problems associated with the                      
inter-calibration of the charged particle detectors aboard PVO. This file     
is available in ASCII format.