Table 4.
Median and 68% confidence level uncertainty values of the parameters of the different models, based on the point-like (top) and extended (bottom) modeling of the sources, as described in Tables 1 and 2.
| Parameters | x [″] | y [″] | q | θ [rad] | θE [″] | rcore [″] | γ′ | γext | ϕext [rad] | zC | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Point-like | A,B | PIEMD |
 |
 |
 |
 |
 |
[0.0] |
 |
 |
||
| SPEMD |
 |
 |
 |
 |
 |
[0.0] |
 |
 |
 |
|||
| A,B,C | PIEMD+rc |
 |
 |
 |
 |
 |
 |
 |
 |
 |
||
| SPEMD |
 |
 |
 |
 |
 |
[0.0] |
 |
 |
 |
 |
||
| Extended | A,B | PIEMD |
 |
 |
 |
 |
 |
[0.0] |
 |
 |
||
| SPEMD |
 |
 |
 |
 |
 |
[0.0] |
 |
 |
 |
|||
| A,B,C | PIEMD+rc |
 |
 |
 |
 |
 |
 |
 |
 |
 |
||
| SPEMD |
 |
 |
 |
 |
 |
[0.0] |
 |
 |
 |
 |
||
Notes. Statistics are extracted from the final MCMC chains with 106 steps. To compare properly different models with different numbers of observables and degrees of freedom, we have rescaled the errors on the observed multiple images for each model, so that its 
value is approximately equal to that of the number of d.o.f.
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