... F160W

In the rest of the paper, we will refer to the F814W, F110W, F160W filters as I, J, H bands for commodity.

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... models

The statistical interpretation of the Bayesian analysis remains, however, valid because systematic deviations between observations and models add a constant shift to the $\chi ^2$ that does not modify the probability distributions.

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... observer

Albedo effects are superimposed on those of the phase function. The albedo also varies vertically in the disk, but the relative differences are much smaller than for the phase function.

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... 25 AU

Depending on grain models, and in particular on the fraction of silicates in the grains, the relative opacities at 3.8 and 10 $\mu$m vary widely and the zone that is probed at 10 $\mu$m is difficult to estimate beforehand. On the other hand, a geometrical study, similar to the one realized by 04, at a wavelength close to 10 $\mu$m would give essential information on this opacity ratio and, as a consequence, on the composition of grains.

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