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Fig. 7.

image

Photometric and astrometric precision obtained with the minimization of the Hessian for the L′ (top panel) and M′ (bottom panel) data. The circular points show the azimuthally averaged position and contrast offset between the injected and retrieved values. The symbol sizes increase in steps of 4 PCs in the range of 20–40 PCs. The precision is tested for different widths (increasing in steps of 10 mas) of the Gaussian filter that is used to lower pixel-to-pixel variations before the Hessian is calculated. The bars show the variance of the six azimuthal positions, averaged over the six values of the PCs that were tested. The color coding is the same for the bars and the data points.

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