APPENDIX C 67 



180 150 120 90 60 30 30 60 90 120 150 



180 150 120 90 60 30 30 60 90 120 150 180 



Figure C-7. Gradient (N /km) exceeded 10 percent of the time for 100-m layer: May. 



180 150 120 90 60 



30 60 90 120 150 180 



180 150 120 90 60 30 30 60 90 120 150 180 



Figure C-8. Gradient (N/km) exceeded 2 percent of the time for 100-m layer: May. 



