The joint k- and z-dependence of stochasticity parameter r(k, z) ≡ b_r(k, z)/b(k, z) is shown here. The contours are drawn for the value of r = 1 to −0.5 at an interval Δr = 0.1 (left to right). The entire region to the left of the r = 1 contour corresponds to a fixed value of r = 1.