Table 1
β and γ parameters estimated from simulations and based on the whole central image (standard method) or only on the inner or outer areas of the image.
| Lout | Lin | Stand. | In. area | Out. area | |||
| (%) | (%) | β | γ | β in | γ in | β out | γ out |
|
|
|||||||
| 100 | / | 1.08 | 0.94 | 0.07 | |||
| 100 | 24 | 0.93 | –0.04 | 0.88 | –0.10 | 0.04 | 0.06 |
| 100 | 35 | 0.90 | –0.04 | 0.79 | –0.10 | 0.11 | 0.05 |
| 80 | 24 | 0.75 | –0.05 | 0.70 | –0.13 | 0.05 | 0.08 |
| 80 | 35 | 0.68 | –0.05 | 0.56 | –0.11 | 0.12 | 0.06 |
Notes. Different Lyot stop configurations have been simulated, with the first line corresponding to an unobstructed entrance pupil (hence the nonspecified inner diameter of the Lyot stop), while all the other cases result from an annular entrance pupil with 24% central obstruction.
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