Comparison of the CO, CH3OH, H2CO, CS, and HNC mixing ratios with respect to HCN derived from the SMT observations assuming direct release from the nucleus in comets C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR) plotted in logarithmic scale. Error bars are 1-σ statistical uncertainties. The shaded areas indicate typical values of the relative Q/QHCN abundances measured in a sample of comets (Crovisier et al. 2009).
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