Table 8: Line intensity ratios.

Galaxy		 CO  $\frac{2{-}1}{1{-}0}$ CN  $\frac{2{-}1}{1{-}0}$ HCN  $\frac{3{-}2}{1{-}0}$ HNC  $\frac{3{-}2}{1{-}0}$
NGC 3079 0.77 $\pm$ 0.20 0.48 $\pm$ 0.15 0.18 $\pm$ 0.06 0.25 $\pm$ 0.12
NGC 1068 0.81 $\pm$ 0.21a 0.19 $\pm$ 0.05 0.47 $\pm$ 0.14 0.15 $\pm$ 0.05
NGC 2623 b - - 0.36 $\pm$ 0.15
NGC 1365 0.84 $\pm$ 0.12c 0.44 $\pm$ 0.12 0.42 $\pm$ 0.12 -
NGC 7469 0.97 $\pm$ 0.28 - - $\la$0.20
a
For NGC 1068 we corrected the JCMT CO J=2-1 observations to the beam size of the SEST CO J=1-0 line, applying the factor 20/44, the ratio between the respective beams. With this, the beam dilution effect is cancelled in both transition lines.
b
See Casoli et al. (1988).
c
For NGC 1365 we also corrected the CO J=2-1 observations to the beam size of the CO J=1-0 line, applying the factor 25/44 between the respective SEST beams. The ratio given above is slightly higher than the one reported by Sandqvist et al. (1995).

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