Pearson correlation coefficients of the relations between molecular abundances and molecular hydrogen density, considering the total sample (first column), the molecular cloud of the points (second, third, and fourth columns), the extinction bins (fifth, sixth, and seventh columns) and the density bins (eighth, ninth, and tenth columns). Numbers in brackets correspond to the null hypothesis probability in each case, i.e. probability of no relation between variables, where a value higher than 0.001 is considered to indicate no relation at all.