Table 2. Values of the depth and refractive index calculated from the iterative algorithm for each of the ten unique pair combinations for the 5 locations A, B, C, D and E. The mean of each value is calculated and presented with the standard deviation. These calculated values are compared to the measured values and the percentage difference between the measured and calculated is given in the bottom row of the table.

Pair	Depth at location (mm)					Refractive index
	A	B	C	D	E	n OCT	n THz
[A, B]	3.137	2.966				1.423	1.493
[A, C]	3.115		3.145			1.428	1.509
[A, D]	3.132			1.299		1.418	1.502
[A, E]	3.116				1.296	1.418	1.517
[B, C]		2.954	3.155			1.430	1.499
[B, D]		2.975		1.305		1.420	1.487
[B, E]		2.960			1.302	1.419	1.502
[C, D]			3.145	1.291		1.427	1.510
[C, E]			3.129		1.289	1.427	1.525
[D, E]				1.292	1.297	1.408	1.524
Mean Calculated Value	3.125 ± 0.011	2.964 ± 0.009	3.143 ± 0.011	1.297 ± 0.011	1.296 ± 0.010	1.422 ± 0.007	1.507 ± 0.013
Measured Value	3.05 ± 0.04	2.87 ± 0.05	3.08 ± 0.06	1.26 ± 0.04	1.27 ± 0.04	1.43 ± 0.04	1.53 ± 0.08
Difference (%)	2.5%	3.3%	2.1%	2.9%	2.0%	−0.6%	−1.5%