Deriving Dark Matter; specifically looking for a table of stellar speed versus distance from center of galaxy to derive dark matter
It is very difficult to measure Galactic orbital speeds of stars in our galaxy for several reasons.  We are moving with them and do not have a reliable measurement yet of even our own orbital motion. We only get one component of motion, the radial component (although Gaia is about to change that).  Dust in the galactic plane prevents us from seeing very far in our own galaxy.  So, when we measure Dark Matter in galaxies, it usually done in other galaxies where we can see both sides of the galaxy and, except for inclination angle, directly measure the orbital motion.