A COMPILATION OF INTERSTELLAR COLUMN DENSITIES

We have collated absorption line data toward 3008 stars in order to create a unified database of interstellar column densities. These data have been taken from a number of different published sources and include many different species and ionizations. The preliminary results from our analysis show a tight relation [N(H)/E(B-V) = 6.12 x 10(21)] between N(H) and E(B-V). Similar plots have been obtained with many different species, and their correlations along with the correlation coefficients are presented.