100,000 TTF ye r —=—_* Tv T Yr YS HEIGHT IN FEET 80,000 e (5) — Ang, eee 2 ( 60,000 L pelOM L (5) °50 +” v7 (4) 7 63 (6) > 5)" o"f5q =«(!9 7 (3) 6% a” < Oo » 3 5 a - LJ z < (2) 3 ~O oO Zz dj -IN aa 2 = =< ON oO wn =° w < a 40° 30° 20° NORTH : a . /00 \ ~ Nag \. ‘N | 200 MG 300 3 500 gq L 10° 4100 \‘ = ae uJ moa gt 90° 60° e8 (3) 3 LC (6) *(2 40,000 =D en 20,000 03 (4) (4) - (5) eax ™—~—~—CSCS SN PRESSURE IN MILLIBARS 9215 O° gd 10° LATITUDE 20° 30° 40° 1000 60° 90° SOUTH Fig. 1 -- Average concentration of carbon-14 in the stratosphere, April to September, 1955. 27