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. 2021 Oct 19;21(20):6932. doi: 10.3390/s21206932

Figure 1.

Figure 1

A visualization of tables with features. The green color represents the possibilities for creating a ratio index, the first table (top) are the possibilities reported in the related work to create a single-channel ratio index, while the second table (bottom) are the possibilities explored in our novel multichannel approach.