Simulated inspection data with 32 top detectors for the TNT block in position 8 (see Fig. 19) of the wood cargo container. The gamma-ray spectrum (top, left) corresponds to the TNT area as shown in Figure 22. The first triangle diagram (top, right) shows the large uncertainty area due to statistical fluctuations and the next triangle diagram (bottom, right) shows the improvement with the synthetic spectra approach. The distributions of the O/C and N/C elemental ratios obtained with the synthetic spectra method are shown in the bottom, left panel.