Figure 4. Plots of real (ε’) and imaginary (ε’’) terms of permittivity values calculated from spectroscopy data for water (blue triangles), normal breast (green circles) and tumour breast tissue (red crosses).

(a) Shows the real versus imaginary permittivity, together with the best fit double Debye model determined from the least squares fitting method for water (full blue line), normal breast (green dotted line) and breast tumour (red dot-dash line), (b) Real terms of permittivity versus frequency and (c) Imaginary terms of permittivity versus frequency.