**Table 5:** Fitted values of the parameters of best SIE + $\gamma$ model after introducing an m=4 multipole ( $\varepsilon _4, \theta _4$ ). The lens position is fitted. Same notations as in Table 4.
$\theta_{\rm E}('')$	$\varepsilon$	$\theta _\varepsilon$ (PA)	$\gamma$	$\theta _\gamma$ (PA)	$\varepsilon_4('')$	$\theta_4$ (PA)	$\Delta_\alpha('')$	$\Delta_\delta ('')$	$\chi_{\rm a}^2$ / $\rm d.o.f._a$	$\chi_{\rm e}^2$ / $\rm d.o.f._e$	d.o.f. $_{\rm a}$	d.o.f. $_{\rm e}$
1.848	0.177	-60.78	0.124	-85.01	-0.03	11.05	<0.001	<0.001	21.9	38.9	1	670

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