Table 4
Lens mass parameters and their priors.
| Component | Parameter | Description | Prior | Prior range/value |
|---|---|---|---|---|
| xm ["] | x-centroid | Gaussian; Flat prior in SSB reconstruction | Centered on starting value, Gaussian | |
| σ = 0.3 | ||||
| Primary | ym ["] | y-centroid | Gaussian; Flat prior in SSB reconstruction | Centered on starting value, Gaussian |
| σ = 0.3 | ||||
| Deflector | qm | Axis ratio | Flat | [0.3, 1] |
| (PIEMD/ | ϕm [°] | Position angle | Flat | [0, 360] |
| SPEMD) | θε ["] | Einstein radius | Flat | [0.5, 3] |
| rc ["] | Core radius | Exact | 10-4 | |
 |
Power-law index (SPEMD) | Exact; flat in SSB modeling | 0.5; [0.3, 0.7] | |
| xm,sat [ ] | x-centroid | Exact | Fixed to satellite light centroid | |
| Satellite | ym,sat [ ] | y-centroid | Exact | Fixed to satellite light centroid |
| Deflector(s) | qm,sat | Axis ratio | Exact | 1 |
| (SIS) | ϕm,sat [ ] | Position angle | Exact | 0 |
| θE,sat ["] | Einstein radius | Flat | [0.01, 3] | |
| rc,sat ["] | Core radius | Exact | 10−4 | |
 |
Power-law index | Exact | 0.5 | |
| External | γext | Magnitude | Flat | [0, 0.6] |
| Shear | ϕext [°] | Position angle | Flat | [0, 360] |
Notes. The position angles ϕm, ϕm,sat, and ϕext are measured counterclockwise from the positive x-axis (east of north). In case of the centroid coordinates, the modeling code starts with a Gaussian prior centered on the starting value obtained from the user input, which is removed after lens light modeling. The power-law index 
was fixed to 0.5 (isothermal) in the beginning and was changed to a flat prior during arc light modeling and SSB reconstruction.
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