Today Christina Eilers (MIT) and I got in a call with Hans-Walter Rix (MPIA) to discuss our Milky-Way disk project. He opined that our measurement of the spiral structure is indeed both the clearest picture of it in the $X-Y$ plane of the Milky Way disk, and also the only measurement of its dynamical influence or amplitude. So that was a good boost for morale, and we promised to send him a full outline of our paper, with figures and captions and an abstract, next week.
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