The authors thank H. M. Woolf and P. van Delst for the ATOVS forward model development in IAPP. C. Sisko generated the display software for IAPP retrieval products. W. L. Smith gave many good suggestions in IAPP development. Three anonymous reviewers’ comments were of considerable help in improving the text and clarifying the issues. This work was conducted with support from NOAA Grant NA67ECO100 and with funds provided by licensing of the International TOVS Processing Package (ITPP), the predecessor to the IAPP.
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