Table 1: Left: relative positions between the different lensed components (B, C, D) and the lensing galaxy (G) with respect to component A as deducted from the best seeing EFOSC-2 frame using the GENERAL (GEN) and MCS codes (see text). Right: relative magnitude of the B, C, D lensed images with respect to A deducted with the MCS method at two different epochs. The last two columns give respectively the amplification $\mu_{\textrm{\tiny{exp}}}$ (sign = parity) predicted by the SIS$+\gamma $ model and the corresponding relative magnitude with respect to A (Sect. 4).
ID $\Delta \alpha \cos \delta('')~(J2000)$ $\Delta \delta ('')~(J2000)$  V (02/05/2002)  V (18/12/2002) R (18/12/2002) $\mu_{\textrm{\tiny{exp}}}$ $\Delta m_{\textrm{\tiny {exp}}}$
  GEN MCS GEN MCS MCS model
A $\rm 11 h 31 m 51.6 s$ $-12\hbox{$^\circ$ }31\hbox{$^\prime$ }57\hbox{$^{\prime\prime}$ }$ 0 0 0 -25.78 0
B $+0.024\pm0.002$ $+0.029\pm0.003$ $+1.201\pm0.002$ $+1.189\pm0.004 $ $-0.45\pm0.04$ $-0.46\pm0.06$ $-0.49\pm0.06$ 14.67 +0.61
C $-0.563\pm0.003$ $-0.573\pm0.002$ $-1.062\pm0.003$ $-1.124\pm0.003$ $+0.62\pm0.07$ $+0.62 \pm 0.08$ $+0.57\pm0.08$ 14.68 +0.61
D $-3.122\pm0.010$ $-3.088\pm0.036$ $+0.884\pm0.010$ $+0.821\pm0.013$ $+2.14\pm0.11$ $+2.16 \pm 0.14$ $+1.83\pm0.14$ -1.53 +3.07
G $-1.898\pm0.015$ $-1.911\pm0.034$ $+0.559\pm0.015 $ $+0.542\pm0.023$ - - - - -


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