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Table A.2

Radial velocities of MSP 18 measured using various absorption lines and the weak C iiiλ 5696 emission line.

Date Radial velocity
HJD-2 454 000 Hβ He iiλ 5412 C iiiλ 5696 Hα He iiλ 6683
(km s-1) (km s-1) (km s-1) (km s-1) (km s-1)

532.587  −41.7  −3.9  −16.8  −122.1 4.2
532.631  −46.1 1.7  −0.9  −123.8 9.1
534.581  −45.5  −2.1  −17.0  −122.3 9.9
534.628  −33.5  −2.0  −17.3  −118.4 14.9
536.624  −42.8  −2.0 1.0  −122.7 6.3
537.626  −34.3 0.6  −8.3  −120.3 19.2
538.719  −50.1  −0.5  −6.8  −122.3 6.4
539.622  −44.6  −0.3 7.2  −122.5 0.8

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