**Table 2:** Description of data sets.
Data set^a	Date	Position^b	$R_\odot$ (arcsec)^c
1	30 May 2002	X=0, Y=1150	956.5
2	28 May 2002	X=0, Y=-1150	956.5
3	19 Nov. 2003	X=0, Y=1145	980.0
4	12 June 2004	X=0, Y=-1140	960.0

^a Observations are all made with the $1\hbox{$^{\prime\prime}$ }$ $\times$ $300\hbox{$^{\prime\prime}$ }$ slit, and detector A. In data sets 2-4, only the Mg X 625 Å line was analysed in the present paper, for comparison purpose.
^b Position of the centre of the slit, in arcseconds from disc centre.
^c Solar radii as seen from SOHO.

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