Fig. 1

Intensity response functions to temperature for a two-level atom line in FALC model atmosphere normalized with respect to the emergent profile, given in units of 10-4. Top left: numerical (finite difference) computation of intensity responses; top right: responses computed analytically using the method described in the paper; bottom left: responses computed using FDC approach; bottom right: relative differences, normalized with respect to the maximum response, between analytical and numerical computations (in log scale).
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