Figure 2

The raw and normalized data compared. The raw as unprocessed data consists of 208 vectors, and each vector (panels) has got varying number of spike counts between zero and 188 for 13 ILD levels from −30 dB to +30 dB with the increment of 5 dB (A), and (Additional file 1). The normalized data by the UTPM function perfectly preserves the shapes of raw-data while scales the number of spike counts down by %92.38 (B), Table 1. Therefore, there is not much differences observed between normalized data in (B) and raw data in (A).