Fig. 5.
Comparison of the spectrum of VX Sgr (2018-06-06, black) to the spectrum of UY Sct amd BI Cyg observed with the SES spectrograph around the Rb I lines at 7800.26 Å (left) and 7947.60 Å (right). The vertical line indicates the position of the Rb I lines, and the dashed vertical line indicate the position of the circumstellar Rb I component.
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