Figure 8
From: Enhancement of acoustic tomography using spatial and frequency diversities
![Figure 8](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1687-6180-2012-225/MediaObjects/13634_2011_Article_362_Fig8_HTML.jpg)
Experimental results obtained by different algorithms, (Parra, SOS or SOS + Parra), on divers configurations and using a normalized performance index (here the three curves represent maximum, minimum and average performance levels). Further details are given in Section “Experimental results”.