Figure S3. Observed (real data noise-added), FWI inverted and the difference between inverted and observed data for transmitters at the depth of major tracer intrusion (6 m) and at depth where no intrusion occurs (9.6 m). This figure is complementary to Figure 13 in the paper. Data is presented for the (a) Desalinated (tracer case in Figure 10 a ) and (b) High (tracer case in Figure 10 e ) tracer cases. Note that for the High case in (b) for the transmitter at 6 m depth panel where the signal is weaker because it the wave travels through the increased σ of the tracer, the color scale is 30 times smaller. r2 quantifies the correlation between FWI inverted and the observed data. The standard deviation of the Gaussian ambient noise was 4.6∙10-8 in all cases. Figure S3 (in Supplements) show Desalinated and High tracer cases.