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A new stratospheric and tropospheric NO<sub>2</sub> retrieval algorithm for nadir-viewing satellite instruments: applications to OMI

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Table 1. Comparison of SP1 and SP2.
Fig. 1. Flow diagram of retrieval algorithm for stratospheric and tro- tro-pospheric NO 2 columns
Fig. 2. Maps of 21 March 2005 OMI NO 2 data showing STS algorithm steps. (a) Slant columns
Fig. 4. Mean tropospheric NO 2 vertical-column errors (solid cir- cir-cles) as a function of cloud radiance fraction, based on SP2 data from 21 March 2005
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