Fig. 11From: Comparison of three retrievals of COSMIC GPS radio occultation results in the tropical upper troposphere and lower stratosphereComparison of T and Brunt–Väisälä frequency square (N 2) between GPS-RO and a radiosonde on October 4, 2011. CPT and LRT are shown by open circles and arrows in the left panel, respectively. In the right panel, the dotted line shows −dT/dz equal to 2 K/km. Arrows correspond to the altitudes of LRTBack to article page