w(
θ
) isnt so hard to measure from various
surveys just need positions.
ξ
(r) is harder must have redshifts to do
properly.
Can make some assumptions however.
Observationally verified parameterization works
for scales of 100 h
-1
kpc to 10 h
-1
Mpc, and you get
r0 = 5 h
-1
Mpc and
γ
= 1.8.
Note use of h.