In order to assemble the opacity table, we take into account
either only dust opacity data for low temperatures, 
K, or only gas opacity data for higher temperatures. As
has been shown by many authors (e.g., Lenzuni, Gail, &
Henning [1995]), it is an accurate approach because dust
dominates the absorbing properties of matter whenever it presents.
However, for the dust-to-gas transitional region (
from 
K to 
K), where the last dust grain population
evaporates, it is necessary to calculate the opacity of dust and gas
simultaneously. In this narrow temperature range the
resulting Rosseland and Planck mean opacities are certainly going down by
few orders of magnitude, so one can apply a simple linear
interpolation to estimate their values with a good accuracy.
Still, we note that our table may give not very reliable
opacity data for that temperature range.