Helium Lines (4.50 – 5.00 microns)
Infrared Helium Lines
| Atomic Line | Transition | Wavelength (um) |
| HEII | 23-12 | 04.5048 |
| HEI | 5S-4P,1S-1Po | 04.6066 |
| HEII | 14-10 | 04.5606 |
| HEII | 22-12 | 04.6640 |
| HEI | 5S-4P,3S-3Po | 04.6950 |
| HeII | 11-17 | 04.743 |
| HEII | 17-11 | 04.7488 |
| HeII | 7-8 | 04.764 |
| HEII | 8-7 | 04.7642 |
| HEII | 21-12 | 04.8691 |
| HeI | 2P-2P | 04.8830 |
| HEII | 20-12 | 05.1240 |