38 A WORLD ATLAS OF ATMOSPHERIC RADIO REFRACTIVITY 



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



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



Figure A-12. Wet-term scale height in km, H w : May. 



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-13. Mean density tropopause altitude in km, z t : May. 



