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Table 1.
Free parameters in our model of inference.
| Ψbulk | Bulk phase-space density parameters |
| ak | Weights of the Gaussian mixture model |
| σz, k, σw, k | Dispersions of Gaussian mixture model |
| W ⊙ | Vertical velocity of the Sun relative to the bulk |
| Ψz − mask | Mask in z |
 |
Amplitudes |
 |
Means |
 |
Dispersions |
| Ψspiral | Spiral phase-space density parameters |
| ρh = {1, 2, 3, 4} | Mid-plane matter densities |
| t | Time since the perturbation was produced |
 |
Initial angle of the perturbation |
| α | Relative density amplitude of the spiral |
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