Table 3: Properties of the fifth images on real data (R.) and predicted from the best lens modeling (IS or NFW). The positions (x,y) are given in arcsec, with respect to the cD centroid. Position angles (PA) are given in degrees and a/b is the axis ratio. The errors are found from the changes when varying some SExtractor parameters. Although both the position angles and the ellipticity of the IS and NFW are compatible with the data, there is a significant difference in positions. The offset $\vert\delta\vec{x}\vert$ between the IS and the real position is only $0.16\hbox {$^{\prime \prime }$ }$ , whereas it is $0.36\hbox {$^{\prime \prime }$ }$ for NFW, which is larger than uncertainties on observations (third column $\vert\delta \vec{x}\vert \sim 0.05\hbox{$^{\prime\prime}$ }$ ).
ID (x,y) $\vert\delta\vec{x}\vert$ PA a/b S/N

R. (0.64;0.70) 0.05 $28\pm 14$ $3.1\pm1.3$ 2.6

IS (0.52;0.81) 0.16 15. 2.2 2.6

NFW (0.33;0.52) 0.36 27. 2.2 2.1

**Table 3:** Properties of the fifth images on real data (R.) and predicted from the best lens modeling (IS or NFW). The positions (x,y) are given in arcsec, with respect to the cD centroid. Position angles (PA) are given in degrees and a/b is the axis ratio. The errors are found from the changes when varying some `SExtractor` parameters. Although both the position angles and the ellipticity of the IS and NFW are compatible with the data, there is a significant difference in positions. The offset $\vert\delta\vec{x}\vert$ between the IS and the real position is only $0.16\hbox {$^{\prime \prime }$ }$ , whereas it is $0.36\hbox {$^{\prime \prime }$ }$ for NFW, which is larger than uncertainties on observations (third column $\vert\delta \vec{x}\vert \sim 0.05\hbox{$^{\prime\prime}$ }$ ).
ID	(x,y)	$\vert\delta\vec{x}\vert$	PA	a/b	S/N
R.	(0.64;0.70)	0.05	$28\pm 14$	$3.1\pm1.3$	2.6
IS	(0.52;0.81)	0.16	15.	2.2	2.6
NFW	(0.33;0.52)	0.36	27.	2.2	2.1

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