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Table 1.
Imaging hyperparameters used in the eht-imaging pipeline.
| Image parameters | Values |
| Pixel size | 30 μas |
| Number of pixels | 170–440 |
| Field of view | 5.1–13.2 mas |
| Observation parameters | |
| Added systematic error | 0.5% (of visibility amplitudes) |
| Time averaging | 30 s |
| Prior parameters | |
| Prior image | Gaussian/CLEAN image |
| Gaussian FWHM (maj axis) | 1375–3250 μas |
| Gaussian FWHM (min axis) | 385–910 μas |
| Gaussian orientation | −6° |
| Optimization parameters | |
| Max N iterations | 200 |
| Data term weights (steps 1–2) | |
| Vis | 0–1 |
| Amp | 0–1 |
| Cphase | 1–1 |
| Logcamp | 1–1 |
| Regularizer weights (steps 1–2) | |
| Flux | 50–10 |
| Entropy | 0.1–1 |
| ℓ1 | 0.1–10 |
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