Fig. 7
From: Development of a multi-layer high-efficiency GEM-based neutron detector for spallation sources

Overlap of two ToF spectra. The orange plot indicates the ToF spectrum obtained with the empty sample-holder. The blue one is the ToF spectrum of a Cadmium sample; in fact, the drop at 1.3 ms is due to the resonance at 0.5 eV, which absorbs all neutrons below this energy.