74 



TROPOSPHERIC REFRACTION 



C/0 



< 



< 



or 



h- 



24 



22 



20 



18 



14 



12 



10 



20 30 40 50 60 70 80 90 



-AN 



Figure 3.12. Comparison of t versus AN as obtained from CRPL reference atmos- 

 pheres — 1958 and 6-year mean radiosonde data for 0o = 0, h. — he = S km. 



