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We present observations of the $J$=1--0, 2--1, and 3--2 rotationaltransitions of N$_2$H$^+$ and N$_2$D$^+$ towards a sample of prototypical darkclouds. The data have been interpreted using non--local radiative transfermodels.

N2H+ and N2D+ in interstellar molecular clouds. II- Observations