Helium Lines (1.80 – 2.05 microns)
Infrared Helium Lines
| Atomic Line | Transition | Wavelength (um) |
| HEII | 19-8 | 01.7717 |
| HEII | 18-8 | 01.8167 |
| HEII | 9LIMIT | 01.8450 |
| HEI | 4P-3D,1Po-1D | 01.8561 |
| HEII | 6-5 | 01.8639 |
| HEI | 4F-3D,3Fo-3D | 01.8691 |
| HEI | 4F-3D,1Fo-1d | 01.8702 |
| HEII | 17-8 | 01.8725 |
| HEII | 8-6 | 01.8753 |
| HEII | 11-7 | 01.8770 |
| HEI | 8S-4P,3S-3Po | 01.9068 |
| HEI | 4D-3P,1D-1Po | 01.9094 |
| HEI | 4P-3D,3Po-3D | 01.9548 |
| HEII | 15-8 | 02.0379 |
| HEI | 6P-4S,3Po-3S | 02.0430 |
| HEI | 2P-2S,1Po-1S | 02.0587 |