Fig. 8
Relationships among x(N2H+), x(CCH), and N(CCH)/N(N2H+). Left: x(N2H+) vs. x(CCH). Right: N(CCH)/N(N2H+) vs. x(N2H+). Sources of I04181, HH211, L1524 and L1598 are marked as red squared data points. The circled data points are obtained from Liu et al. (2019). The circled data points are marked in red or blue according to whether or not they harbor an IRAS source.
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