Table 3: Radial velocities relative $\beta$ Pic of ions measured in absorption.
Ion $\Delta v^{{\rm a}}$ $\sigma_{\Delta v}^{{\rm b}}$

km s^-1 km s^-1

Fe I -0.0 0.3

Na I -1.2 0.3

Ca II $^{{\rm c}}$ -0.3 2.1

Ti II 0.2 0.8

Ni I 0.4 0.4

Ni II 2.8 3

Cr II 2.2 3

$^{{\rm a}}$
The positive direction is radially away from us, towards $\beta$ Pic.
$^{{\rm b}}$
Errors are relative only. An additional systematic error of 0.5 km s^-1 comes from the uncertainty in the system velocity of $\beta$ Pic.
$^{{\rm c}}$
The radial velocity of Ca II is measured on the infrared lines $\lambda$ 7291.47 and $\lambda$ 7323.89, and not the optically thick Ca II H & K lines.

**Table 3:** Radial velocities relative $\beta$ Pic of ions measured in absorption.
Ion	$\Delta v^{{\rm a}}$	$\sigma_{\Delta v}^{{\rm b}}$
	km s^-1	km s^-1
Fe I	-0.0	0.3
Na I	-1.2	0.3
Ca II $^{{\rm c}}$	-0.3	2.1
Ti II	0.2	0.8
Ni I	0.4	0.4
Ni II	2.8	3
Cr II	2.2	3

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