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Fig. 4

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RD = DCO+/ HCO+ (thick line, left axis) and x(DCO+) = n(DCO+) /nH (dashed line, right axis) as a function of ζ, for T = 10 K and nH = 8 103 cm-3, i.e. the physical conditions characterising position N5. The HIP and LIP are marked. The hatched area shows the range of observed RD at that position.

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