Table 2.

Results of the characterization measurements obtained by different laboratories: the intrinsic absorption coefficient ε_a,ink and the intrinsic reduced scattering coefficient ${\epsilon }_{s,\text{il}}^{\prime }$ with their statistical uncertainties ${\mathit{RU}}_{\text{ink}}^{\text{stat}}$ and ${\mathit{RU}}_{\text{il}}^{\text{stat}}$, and the limits of their relative systematic errors, ${\mathit{RU}}_{\text{ink}}^{\text{syst}}$ and ${\mathit{RU}}_{\text{il}}^{\text{syst}}$, for India ink and IL respectively, are reported at the different wavelengths λ considered.

λ (nm)	εa,ink (mm−1)	${\mathit{RU}}_{\text{ink}}^{\text{stat}}$	${\mathit{RU}}_{\text{ink}}^{\text{syst}}$	${\epsilon }_{s,\text{il}}^{\prime }$ (mm−1)	${\mathit{RU}}_{\text{il}}^{\text{stat}}$	${\mathit{RU}}_{\text{il}}^{\text{syst}}$	Lab.
633	384.3	0.4%		26.6	2.4%		POLIMI
633	354.7	12%		26.5	1.6%		INO
633	393	2%		25.1	3%		TomOptUS
633	375.3	1.6%		26.0	1.8%		UNIFI
633	385.5	6.5%		26.3	0.6%		ILM
687	340	0.9%	3%	23.1	0.8%	5%	ICFO
750	325	1.7%		21.7	2.4%		POLIMI
750	306.5	12.5%		21.6	2%		INO
751	336	2%		26	4%		TomOptUS
751	318.7	1.5%		21.1	1.8%		UNIFI
750	321.8	5.6%		21.3	1.1%		ILM
750	305.4	1.5%		21.4	5%		PTB
751	346.6	0.7%	2.5%	20.5	0.8%	10%	ULUND
785	303	0.7%	3%	19.4	0.9%	5%	ICFO
833	309	3.2%		18.8	3.2%		POLIMI
830	313.5	15%		18.9	2.3%		INO
830	262	1.1%	5%	18.5	2.4%	5%	IBIB
833	302	3%		22.3	3%		TomOptUS
833	288.7	1.6%		18.5	1.6%		UNIFI
830	288	0.7%	3%	17.4	1%	5%	ICFO
830	288.9	5%		18.8	0.7%		ILM
830	277.3	1.5%		18.9	5%		PTB
833	292.0	1.0%	2.5%	17.9	0.9%	10%	ULUND
916	257.3	1.2%	2.5%	16.1	0.9%	10%	ULUND