This version of ``An Atlas of a Dark Sunspot Umbral Spectrum from 1970 to
8640 cm-1 (1.16 to 5.1 microns)'' (N.S.O. Technical Report #92-001, March 
1992) by L. Wallace and W. Livingston is meant to be used in conjunction 
with the original hard-copy version, and the caveats in the text of that 
version apply here equally.

The two spectra on each page of the original are combined into one ascii file
covering the main 20 cm-1 of the page plus 1 cm-1 of overlap on each end.
Each file is given the name ``wnxxxx'' where xxxx is the wavenumber of the
beginning of the main 20 cm-1 of the page.  Thus, wn4080 contains the material
from 4080 to 4100 cm-1 plus 1 cm-1 of overlap on each end.  The first column
contains the wavenumber while the second and third contain the umbral
component and the observed 2.3 air mass spectrum, respectively.

The spectra have been processed so that no adjustment has been made in these
files to set the continuum levels at approximately unity; the intensity
level in each file is continuous with that in the adjacent files.  For
convenience however, the first line in each file contains, centered over
the second and third columns, approximate continuum levels appropriate to
these spectra in frequency range of the file.  The subsequent 2320 lines
of each file contain the spectra.  In the place of the gaps in the original
version of the umbral component we have inserted "9.999999".