Fig. 1
Comparison between the true δni term, and the first-order approximation (right), and residuals (left). The Kogan & Greisen (2009) approximation breaks down away from the facet center (labeled as uv-scaling, dotted line). Applying classical W-projection together with a Kogan & Greisen (2009) style coordinate transformation works better (dashed line), but a blind 3rd–5th-order polynomial works best (solid line).
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