One-dimensional, radial structure in the HD 169142 disk. Vertical brown shaded regions represent the dust rings. Left: DCO+ radial column density (dotted blue) calculated from Eq. (1) using the DCO+ the radial intensity profile (see Fig. 2) and the midplane gas temperature of the optimized DALI model (dot-dash red) as the Tex profile. The gas surface density profile (dashed green) was used to derive the DCO+ radial abundance. Right: radial abundance structure of DCO+ with respect to H2. The blue shaded region represents 1σ errors on the abundance.
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