Figure 3
From: Enhancement of acoustic tomography using spatial and frequency diversities
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1687-6180-2012-225/MediaObjects/13634_2011_Article_362_Fig3_HTML.jpg)
Comparison among estimators (10), (14) and (15), here λ = 0.99 and γ = 0.998. The x-axis represents the discrete time in number of samples and the y-axis is the 4th order cumulants.