Fig. 6.

Noise reduction factor g for low-rank filtering based on partial separability as a function of the estimated rank L̂₁. Empirical values of g (black) and corresponding theoretical approximations (red) were computed according to (18) and (19), respectively. The true rank L₁ = 8. Notice that in the region L̂₁ > L₁, the theoretically predicted values of g tend to its empirical values and both approach 1 in the full-rank case.