Table 1. Spectral accuracy and precision of IMS system as measured against Ocean Optics USB2G38810. Ocean Optics λ_OO –central wavelength as measured by Ocean Optics USB2G38810; Ocean Optics FWHM – full width at half maximum of laser line as measured by the Ocean Optics spectrometer; IMS λ_IMS – central wavelength of laser line as measured by the IMS system; IMS ± σ – standard deviation of measured central wavelength of the laser line as measured by the IMS;IMS FWHM – full width at half maximum of the laser line as measured by the IMS system; Δλ – difference between IMS and Ocean Optics central wavelength.

Ocean Optics λOO[nm]	Ocean Optics FWHM [nm]	IMS λIMS[nm]	IMS ± 1σ [nm]	IMS FWHM [nm]	Δλ λOO-λIMS [nm]
542	8.9	541.7	0.8	15.2	0.3
573.2	4.9	571.7	0.4	13.5	1.5
598.8	5.3	597.6	0.6	16.4	1.2
622	5.4	622.7	0.8	19.1	−0.7
651.7	6.4	652.4	1.0	23.3	−0.7
680.9	6.4	681.4	1.3	25.9	−0.5
698.1	7.7	697.9	1.3	26.9	0.2
703.6	7.8	702.1	2.1	29.9	1.5
723.1	8.8	719.7	3.6	30.0	3.4