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. 2019 Nov 11;19:254. doi: 10.1186/s12872-019-1242-9

Fig. 3.

Fig. 3

Electrode grids used to measure the UEG during the PhysioHeart™ experiments. (left) 11 × 11 electrode grid used with BioSemi ActiveTwo acquisition system (right) 6 × 8 electrode grid used with the National Instruments acquisition system