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What do the black bars on the total absorption spectrum mean? 

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The translational spectrum is found to be responsible for the density dependence of the absorption spectrum, contributing significantly to the profile at high densities and for all frequencies.
The resulting spectrum shows marginal evidence for water vapor absorption, but can also be well explained by a blackbody spectrum.
The calculated absorption spectrum agrees well with the experiment.
It is thought that the spectrum may have some weak absorption line features.
These measurements clarify assignments, based on this vibrational mode, of the visible absorption spectrum as well as of other vibrations.
The simulated absorption spectrum agrees well with those experimentally observed.
We propose that calculating the absorption spectrum using the latter approach will generally be the preferred option.
The results are in good agreement with the absorption spectrum.
The calculated absorption spectrum and its absolute intensity are in good agreement with the experimental results.
If these absorption peaks are broadened and are superimposed on each other, the absorption spectrum observed experimentally can be reproduced.

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