Table 2 Impedances at some frequencies for the electrodes

A_Ag

4200 (2200–6100)

1600 (1100–2200)

820 (600–1000)

240 (210–260)

A_C

2200 (1200–3200)

1200 (1000–1300)

820 (800–850)

570 (520–620)

B_Ag

1880 (860–2800)

880 (760–1000)

560 (470–660)

260 (210–310)

B_C

3400 (1900–5000)

1600 (1400–1700)

1000 (900–1100)

580 (530–630)

C_Ag

1300 (600–2100)

660 (490–830)

440 (350–520)

230 (190–270)

D_Ag

750 (530–980)

440 (340–550)

340 (260–420)

200 (170–230 )

Commercial

57 (47–68)

52 (43–60)

46 (38–53)

38 (32–43)