Fig. 2From: Head phantoms for bioelectromagnetic applications: a material studyThe average conductivity of 2 wt% (n = 3), 3 wt% (n = 3), and 4 wt% (n = 3) agar in 0.17% NaCl solution adjusted to 25 °C for (top) frequencies of 0.1 Hz to 100 kHz and (bottom) 1 Hz for 10 min. Three series of measurements were done for each sample with 30 min in between. The shaded regions show µ ± σBack to article page