aa is the index of the power-law mid-plane density distribution outside the depletion zone; bRi is the size of the inner depletion zone;
cnIR, mIR, and fIR — near-, mid-, and far-IR, respectively; smm — submillimetre;
data available indicating non-standard ratio; ethe absence of the inner depletion zone is inferred from the spectral energy distribution.
is commonly not an easy matter to resolve an 'old' PMS system, either.
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