  We present the density structure of dark matter in the outer parts (to about
7 effective radii) of the elliptical galaxy NGC 4636, from the radial
velocities of 174 globular clusters, using the non-parametric, Bayesian
algorithm CHASSIS. We find the galaxy to be rich in dark matter, with $R$-band
mass-to-light ($M/L$) ratios rising to about 30, at nearly 4$R_e$; the $K$-band
$M/L$ at about 3$R_e$ is found to be nearly 10. The result does not depend on
applying the method to the red and blue globular clusters separately. This
estimate of $M/L$ is higher than the previous analysis from the same kinematic
data. We also find that the dark matter distribution is highly concentrated
towards the inner halo.
