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Table A.1

Coordinates of the multiple images used as constraints in the lens model optimisation.

System A
A.1 A.2 A.3

1 120.2372 36.061151 1 120.24078 36.059618 1 120.24206 36.057857
2 120.23744 36.060832 2 120.23927 36.060178 2 120.24219 36.056926
3 120.23715 36.061185 3 120.24087 36.059567 3 120.242 36.057975
4 120.23727 36.06103 4 120.24057 36.059648 4 120.24214 36.057605
5 120.23779 36.060597 5 120.23838 36.060427 5 120.2423 36.056396
6 120.2373 36.060982 6 120.24046 36.059611 6 120.24217 36.057434
7 120.23739 36.060874 7 120.23999 36.05979 7 120.24221 36.05721
8 120.23716 36.061085 8 120.24068 36.059646 8 120.24209 36.057782

System B
B.1 B.2 B.3 B.4 B.5

1 120.24114 36.05811 1 120.24183 36.055047 1 120.23566 36.054089 1 120.2323 36.061433 1 120.236 36.054733
2 120.24119 36.058177 2 120.2419 36.055106 2 120.23566 36.054132 2 120.23238 36.061464 2 120.23598 36.054772
3 120.2409 36.058445 3 120.24188 36.05483 3 120.23554 36.054066 3 120.23237 36.061354 3 120.23592 36.054688
4 120.24099 36.05842 4 120.24193 36.054947 4 120.23556 36.054111 4 120.23244 36.061406 4 120.2359 36.054695
5 120.24083 36.058612 5 120.24197 36.054809 5 120.23541 36.054089 5 120.23249 36.061351 5 120.23586 36.054602

System C
C.1 C.2

1 120.24193 36.056063 1 120.23206 36.061931

System D
D.1 D.2 D.3 D.4

1 120.23551 36.060743 1 120.2376 36.060501 1 120.24321 36.053464 1 120.23417 36.055649
2 120.23748 36.060537 2 120.2357 36.060719
3 120.23549 36.060665 3 120.23746 36.06045
4 120.23561 36.060677 4 120.23742 36.060507 4 120.24326 36.053421 4 120.23409 36.055685

Notes. Coordinates are in degrees WCS. The redshifts of the sources corresponding to System A, System B and System C are zA = 0.908 ± 0.005, zB = 2.06 ± 0.02 and zC = 2.59 ± 0.01, respectively (Richard et al. 2010). System D is not yet confirmed spectroscopically: for this reason, we included it as constraint only in one dedicated test. The redshift estimates for the knot groups of this system are listed in Table 5.

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