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Table 2.
Progenitor mass and merger ratio estimates derived from a given constraint.
| Constraint | Progenitor mass | Merger ratio |
|---|---|---|
| Stellar metallicity |  M⊙ |
 |
| i-band luminosity and |  M⊙ |
 |
| 15% of stars in shell |
Notes. See text for a description of the uncertainties considered in each case.
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