kinematics and abundances

Today Adrian Price-Whelan (Flatiron) and I resurrected an old project from last summer: Code-named Chemical Tangents, the project is to visualize or model the orbits (tori) in the phase-mixed parts of the Milky Way by looking at the element abundance distributions. The gradients in the statistics of the element-abundance distributions (like mean, or quantiles, or variances, or so on) should be perpendicular to the tori. Or the gradients should be in the action directions and never the conjugate-angle directions. Price-Whelan resurrected old code and got it working on new data (APOGEE cross Gaia). And we discussed name and writing and timeline and so on.

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