(Left) Comparison of the molecular abundances of the IRDCs with low-mass pre-stellar cores from Padovani et al. (2009), Tafalla et al. (2006), Jørgensen et al. (2004) and Ohishi et al. (1992). Black diamonds indicate our IRDC abundances, green diamonds indicate mean values for IRDCs. Black crosses indicate low-mass starless cores, red crosses indicate mean values for low-mass starless cores. (Right) Comparison of the molecular abundances of the IRDCs with HMPOs from Blake et al. (1987), Helmich & van Dishoeck (1997), Pirogov et al. (2003) and Zinchenko et al. (2000, 2009). Black diamonds indicate our IRDC abundances, green diamonds indicate mean values of the corresponding species for IRDCs. Black triangles indicate HMPOs, red triangles indicate mean values of the corresponding species for HMPOs. In both panels the upper limit abundance value for CH3CN for IRDCs was estimated from the average spectrum.
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