Effective temperature as function of the Fe i λ6085.27 Å and Si i λ6155.14 Å line depth ratio for two different abundances. Big circles connected by a blue line mark a case with + 0.4 dex abundance increase for Si and Fe; small circles connected by a red line mark a case with −0.4 dex. The colour of the circles indicates the photometric phase φp. The dashed curve depicts the calibration of Kovtyukh (2007) for supergiants.
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