Fig. 7

Total chargeability A and mean relaxation time B for the root area of one of the investigated pinto bean plants. A chargeability below \(10^{-3}\) is considered as background and therefore masked in grey, the root area is delineated by black lines. For the mean relaxation time, we masked cells outside of the root system area, as values in this area are uncertain due to the low to zero polarizability in this region