871824.fig.003a
(a)
871824.fig.003b
(b)
871824.fig.003c
(c)
871824.fig.003d
(d)
Figure 3: Typical FTIR spectra of the polycrystalline diamonds from the Mengyin kimberlite pipes ((a) and (b) EFPCDs; (c) and (d) ARPCDs).