Keyword Factory
This tool helps you to expand your technical vocabulary using the arXiv dataset.
Note that terms which occur infrequently in arXiv articles will not return good (if any) results.
Read about our method here.
column densities
is associated with:
column-density,   
cm,   
hi,   
clouds,   
gas,   
absorption,   
n-h,   
sightlines,   
ovi,   
hydrogen,   
absorber,   
absorption-line,   
abundances,   
o-vi,   
molecular-clouds,   
ionization,   
dust,   
interstellar,   
molecular,   
dlas
Using these keywords in combination
with column densities will
help you expand your search horizons.