a) Tested asymmetric rotation broadening functions (ARBF). b) Broadened He i 4471 line profiles with ARBF having a = −1 and for several input Vsini parameters. c) FT of the ARBF. d) Resulting (Vsini)A parameters produced by ARBF against the model input (Vsini)0 (the colors correspond to the distortion parameters a in a)).
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