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Table 5

Isotopic line intensity ratios for HCN and NCO+.

Galaxy HCN/H13CN HCO+/H13CO+

NGC 1614  >2.8 4(2)
Mrk 231 6(2) 7(6)
NGC 4418 8(3)  >4
NGC 1068 17(7) 24(20)

Notes. Uncertainties (1-σ) are shown in parenthesis.

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