Table 2: Transmittance properties for filters used in the instrument (Multi IR Optoelectronics Co, China).
| Filter | Center wavelength (nm) and bandwidth (FWHM) | Center wavenumber (cm-1) |
| 1 | 6680 ± 66 | 1497 (1482-1512) |
| 2 | 4300 ± 43 | 2326 (2303-2349) |
| 3 | 3400 ± 30 | 2941 (2915-2967) |
| 4 | 3250 ± 32 | 3077 (3047-3108) |