Density profile of tracer populations: BHB stars from HVS survey (solid circles), BHB stars from SDSS DR6 (open circles), and RR Lyrae from SDSS Stripe 82 (solid squares). The density is calculated directly from observed counts without correcting for sky incompleteness. The true density is a factor ~5 higher. Errors are from Poisson statistics. Lines show best fits for the logarithmic slope, from 3.5 (dashed) to 4 (solid) to 4.5 (dotted).