Table 3: Radial velocities in RX J1548.
Line $\gamma_{\rm em}^{\star}$ $K_{\rm em}^{\star}$ Phase $_{\rm em}^{\star \dag }$ $\gamma_{\rm abs}^{\star \star}$ $K_{\rm abs}^{\star \star}$ Phase $_{\rm abs}^{\star \star \dag }$
  km s-1 km s-1   km s-1 km s-1  
Orbital period            
H$_{\delta }$ -58(4) 54(4) 0.031(2) - - -
H$_{\gamma }$ -60(2) 67(3) 0.025(2) -58(13) 118(19) -0.07(2)
H$_{\beta }$ -63(2) 80(3) 0.014(1) -540(14) 62(20) -0.19(5)
H$_{\alpha }$ -49(4) 103(2) 0.000(1)      
He II $\lambda $ 4686 -58(2) 58(3) 0.046(3)      
He I $\lambda $ 5875 -50(2) 102(3) -0.027(2)      
Spin period            
H$_{\delta }$   66(4) 0.025(2) 200(25) 190(33) -0.45(3)
H$_{\gamma }$   51(3) 0.030(2) -64(11) 89(17) -0.51(2)
H$_{\beta }$   30(3) 0.050(2) -545(14) 100(18) -0.41(2)
H$_{\alpha }$   12(1) 0.002(4)      
He II $\lambda $ 4686   95(3) 0.000(1)      
He I $\lambda $ 5875   22(3) -0.043(5)      
$^{\star}$ Radial velocity curve parameters of emission lines as derived from fitting with a composite two-sine (orbital and spin) plus a constant function the radial velocities on the individual spectra. $^{\star \star}$ Radial velocity curve parameters of absorption components as derived from fitting with a single sine plus a constant function the radial velocities on the phase folded spectra at the spin and orbital periods respectively. $\dag $ Phase of maximum redshift using the orbital and spin ephemerides quoted in the text.

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