When this final time series is inverted, we obtained the bubble population given in (b), the bottom graph (the red curve corresponding to the bubbles which are generated in the first second of the hydrophone trace, and the yellow curve of those generated in the second second).  Having in the bottom graph estimated the bubble population the computer used to generate the time series, we can now look at the top graph (a) and see the actual bubble population the computer had in mind.  They match closely, indicating that our inversion was successful.

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