36 A WORLD ATLAS OF ATMOSPHERIC RADIO REFRACTIVITY 



180 150 120 90 60 



30 



30 60 90 120 150 180 



180 150 120 90 60 30 



30 



60 90 120 150 180 



Figure A-8. Mean sea-level dry term, D : May. 



180 150 



30 30 60 90 120 150 180 



-60 



70 

 180 150 



A. 



— 170 

 30 60 90 120 150 180 



90 60 



30 



Figure A-9. Mean sea-level wet term, W u : May. 



