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Comparison between ring, dot and mixed configurations. Comparison between ring (left-side boxes) and mixed (right-side boxes) designs in tripoles, short-circuited or not: (.+-+.), (o+-+o), (+.-.+) and (+o-o+). The IRs are referred to the corresponding outer bipolar configuration, (+...-). An asterisk is used to show the statistically significant IR (p < 0.05), for further details see Figure 7.
