Files are:

Lya-bXX.dat where XX is the b paramter in km/s
CIV-bXX.dat where XX is the b paramter in km/s

File columns are: (the files have no headers)

For Lya:

Transition  f_osc        EW       bpar    logN
1215.6701   0.4164       0.0054  15.0000  12.0000
.
.
.

For CIV:

Transition  f_osc        EW       bpar    logN
1548.1950   0.1908       0.0004   5.0000  11.0000
.
.
.

Method:

You are going to select a fiducial b parameter, probably b=35 for Lya
and b=10 for CIV, or something like that. For a given QSO sightline
you will have a limiting EW for Lya and for CIV.  Use the tables to
find the logN that corresponds to the EW. If you want a 3sigma limit
(recommended) then multiple the EW limit you have by 3 before you read
the logN corresponding to that value.

If you are interested in how sensitive the limiting logN is to your
chosen fiducial b parameter for the limiting EW, you can examine
different COGs (different b paramters).  This would be for you
edification.  And perhpas a sentence of two in your thesis saying how
sensitive you are (or are not) to the choice of b paramter.  (You can
actually immediately see the sensitivity if you look at the CIV COGs
plotted in my book... or by simply making similar plots yourself and
reading the graphs).
