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Table 6

Measured integrated line intensity HCO+ (6–5)/N2H+ (6–5) ratios towards our source sample.

Source τ HCO+ HCO+ (6–5)/N2H+ (6–5)

VLA1623 3.1 42.5(30.1)
L1527 >4
L1157-MM >3
NGC 1333-IRAS2 4.5 17.0(12.1)
Serpens-FIRS 1 9.2 23.0(5.3)
L1641 S3 MMS 1 >5, <76
Cep E-mm >17, <124
IC 1396N 2.9 15.9(7.8)
NGC 7129-FIRS2 >4, <100

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