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Contribution Functions (1)<br />
The contribution function (CF)<br />
describes how different atmospheric<br />
layers y contribute to the observed<br />
spectrum.<br />
Mathematical definition:<br />
CF ≡ integrand of formal sol sol. of RTE<br />
(here isotropic case, no B field):<br />
line core: highest formation<br />
wings: lowest formation<br />
Intuitively: profile shape indicates<br />
atmospheric opacity. Medium is more<br />
transparent (less heavily absorbed) in wings.<br />
�� one can see „deeper deeper“ into the atmosphere<br />
at the wings.<br />
A. Lagg - Abisko Winter School 9
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