Figure 2
From: The application of THz-TDS in the characterization of Bayan Obo magnetite ore composition

Line chart of TFe and optical parameters at specific frequencies of original ore samples. (a) Log 1 TFe. (b) Log 1 absorption coefficient. (c) Log 1 refractive index. (d) Log 2 TFe. (e) Log 2 absorption coefficient. (f) Log 2 refractive index.