Fig. 5
From: Head phantoms for bioelectromagnetic applications: a material study
The average conductivity of the gypsum sample with NaCl in the casting compound from three series of measurements (color-coded dashed lines) 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. The shaded regions show µ ± σ (purple) and µ ± 0.05µ (blue) for comparison