  The reliability of modeling the far-IR continuum to 13CO J=1-0 spectral line
ratios applied to the Orion clouds (Wall 2006) is tested by applying the models
to simulated data. The two-component models are found to give the dust-gas
temperature difference, $\DT$, to within 1 or 2$ $K. However, other parameters
like the column density per velocity interval and the gas density can be wrong
by an order of magnitude or more. In particular, the density can be
systematically underestimated by an order of magnitude or more. The overall
mass of the clouds is estimated correctly to within a few percent.
  The one-component models estimate the column density per velocity interval
and density within factors of 2 or 3, but their estimates of $\DT$ can be wrong
by 20$ $K. They also underestimate the mass of the clouds by 40-50%.
  These results may permit us to reliably constrain estimates of the Orion
clouds' physical parameters, based on the real observations of the far-IR
continuum and 13CO J=1-0 spectral line. Nevertheless, other systematics must be
treated first. These include the effects of background/foreground subtraction,
effects of the HI component of the ISM, and others. These will be discussed in
a future paper (Wall 2006a).
