Table 2. Similarity analysis of FTIR spectrum of M1~M18.

Sample	M1	M2	M3	M4	M5	M6	M7	M8	M9	M10	M11	M12	M13	M14	M15	M16	M17	M18
M1	1.000
M2	0.929	1.000
M3	0.969	0.967	1.000
M4	0.977	0.930	0.957	1.000
M5	0.991	0.927	0.968	0.981	1.000
M6	0.919	0.938	0.966	0.893	0.915	1.000
M7	0.972	0.950	0.972	0.960	0.969	0.918	1.000
M8	0.976	0.956	0.969	0.988	0.979	0.907	0.973	1.000
M9	0.945	0.950	0.982	0.922	0.940	0.970	0.954	0.936	1.000
M10	0.951	0.974	0.989	0.932	0.945	0.974	0.963	0.950	0.985	1.000
M11	0.954	0.948	0.981	0.923	0.948	0.975	0.953	0.933	0.982	0.982	1.000
M12	0.892	0.955	0.959	0.863	0.884	0.973	0.917	0.890	0.974	0.981	0.969	1.000
M13	0.970	0.971	0.982	0.966	0.971	0.946	0.974	0.977	0.966	0.974	0.972	0.936	1.000
M14	0.967	0.913	0.944	0.961	0.960	0.890	0.951	0.962	0.924	0.929	0.930	0.867	0.964	1.000
M15	0.970	0.968	0.987	0.951	0.969	0.959	0.975	0.964	0.974	0.983	0.983	0.954	0.989	0.947	1.000
M16	0.963	0.962	0.985	0.944	0.957	0.975	0.961	0.954	0.983	0.987	0.984	0.965	0.982	0.947	0.985	1.000
M17	0.941	0.973	0.983	0.920	0.936	0.975	0.957	0.940	0.982	0.992	0.984	0.983	0.972	0.920	0.984	0.985	1.000
M18	0.927	0.942	0.965	0.887	0.915	0.966	0.933	0.906	0.969	0.977	0.973	0.974	0.940	0.892	0.964	0.969	0.982	1.000