**Table 1:** Average positions of the different absorption components. For comparison, the positions of images A and B, as fixed in our continuum source model, are indicated. Offsets are given relatively to the barycenter of the continuum emission.
Velocity	$V_{\rm HEL}$ $^\dagger$	Absorption	$\Delta V_{1/2}$ $^\dagger$	RA offset	Dec offset
component	(km s^-1)	depth $^\dagger$ $^\ddagger$	(km s^-1)	(mas)	(mas)
a	-6.3	0.31	4.7	-84 $\pm$ 36	+28 $\pm$ 75
b	-0.3	0.32	4.5	-73 $\pm$ 24	-28 $\pm$ 51
c	+5.9	0.63	4.5	-60 $\pm$ 12	-11 $\pm$ 26
d	+10.3	0.30	4.4	-57 $\pm$ 38	-27 $\pm$ 79
a+b+c+d	-10 to +12			-61 $\pm$ 15	-15 $\pm$ 32
Image A				-59	-25
Image B				+250	+103

$% latex2html id marker 2025 $\textstyle \parbox{10.5cm}{ $^\dagger$\space From ... ...ef{spec}).\\ $^\ddagger$\space With respect to the total continuum intensity.}$$

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