  It depends. Our experiment reveals that, given an optically thin coma,
generally, the smaller the signal ratio of nucleus to coma, the less reliable
is the cometary nucleus-extraction technique. We strongly suggest the technique
only be applied to cases where the nucleus signal occupies $\gtrsim$10% of the
total signal wherein the bias is no more than a few percent. Otherwise there is
probably no way to debias results from this technique in reality, since its
reliability is highly sensitive to entangling complications, including the coma
profile, and the point-spread function (PSF).
