Fig. 1
Integrated intensity maps of DCO+, N2D+, and DCN with (lower panels) and without (upper panels) a Keplerian mask as explained in Appendix A. The resulting synthesized beams of 
for DCO+ and DCN, and 
for N2D+ using natural weighting are shown at the lower left of each map. Contours are 1σ levels, where σ is estimated as the rms of an emission free region in the sky.
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