Fig. 11.

Kernel-phase histograms computed from a set of images of calibration source SAO 179809 using two aperture models characterized by the same pitch s = 0.109 m. The first model assumes that the aperture is that of entire optical telecope assembly (OTA) and results in the blue histogram. The second model takes into account the misaligned cold mask inside the NICMOS camera and results in the red histogram.
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