Two dimension PSF intensity |ΨB, 0, 0(x, y)|2 from the on-axis point source in plane B, in logarithmic scale. The area is 5.3 arcmin × 2 arcmin. Panel a: ideal PSF, without scattering. Panel b: PSF with speckles, visible from 4 arcmin, because of the wave front error from surface roughness in plane A.
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