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Table 2
Indices used for the automatic spectral classification.
| Index | Blue interval | Central interval | Red interval | Line or band | ANNs trained |
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| *3933 | 3909.0–3918.0 | 3917.0–3950.0 | 4000.0–4020.0 | CaII 3933 | 1,2 |
| *3968+H8 | 3909.0–3918.0 | 3955.0–3988.0 | 4000.0–4020.0 | CaII 3968 + H8 | 1,2 |
| *4026 | 3993.0–4003.0 | 4017.5–4035.0 | 4037.0–4054.0 | He I 4026 | 1 |
| *4033+45 | 4014.0–4025.0 | 4025.0–4051.0 | 4050.0–4054.0 | MnI4033+FeI4045 | 2 |
| 4077F01 | 4011.0–4029.0 | 4070.0–4086.0 | 4160.0–4170.0 | Sr II 4077 | 1,2 |
| 4101F7 | 4011.0–4029.0 | 4090.0–4115.0 | 4160.0–4170.0 | Hδ | 1,2 |
| 4128SiII | 4011.0–4029.0 | 4120.0–4140.0 | 4160.0–4170.0 | HeI4121+SiII4128 | 1,2 |
| 4172+78 | 4160.0–4170.0 | 4168.0–4186.0 | 4209.0–4220.0 | TiII4172+FeII4178 | 2 |
| *4227S | 4207.0–4215.0 | 4216.0–4240.0 | 4241.0–4250.0 | Ca I 4227 | 2 |
| *4300GS | 4241.0–4252.0 | 4283.0–4318.0 | 4358.0–4370.0 | 4300 G band | 2 |
| 4327 | 4241.0–4252.0 | 4320.0–4332.0 | 4358.0–4370.0 | FeI 4325 (blend) | 1,2 |
| *4340n | 4241.0–4252.0 | 4331.5–4352.5 | 4358.0–4370.0 | Hγ narrow | 1, 2 |
| *4383+405 | 4359.0–4370.0 | 4369.0–4412.0 | 4412.0–4422.0 | Fe 4383+4405 | 1, 2 |
| 4455S | 4445.0–4452.0 | 4450.0–4462.0 | 4501.0–4510.0 | CaI 4455 | 2 |
| *4471 | 4445.0–4452.0 | 4463.0–4477.0 | 4501.0–4510.0 | He I 4471 | 1 |
| 4481 | 4445.0–4452.0 | 4476.0–4488.0 | 4501.0–4510.0 | MgII 4481 | 1 |
| 4531L | 4505.5–4515.5 | 4515.5–4560.5 | 4560.5–4580.5 | Fe 4531 blend (Lick) | 2 |
| *4686 | 4660.0–4676.0 | 4676.0–4696.0 | 4696.0–4708.0 | HeII 4686 | 1 |
| 4861w | 4808.0–4828.0 | 4830.0–4896.0 | 4896.0–4916.0 | Hβ 4861 wide | 1, 3 |
| *4861n | 4808.0–4828.0 | 4846.0–4878.0 | 4896.0–4916.0 | Hβ 4861 narrow | 1, 2, 3 |
| *4961TiO | 4930.0–4952.0 | 4953.0–4990.0 | 5156.0–5166.0 | TiO 4961 | 3 |
| 4961M | 4930.0–4952.0 | 4950.0–5090.0 | 5350.0–5385.0 | TiO 4961 band | 3 |
| *5177M | 4930.0–4952.0 | 5160.0–5320.0 | 5350.0–5385.0 | MgI 5177 band | 3 |
| *5177 | 5154.0–5164.0 | 5160.0–5200.0 | 5235.0–5250.0 | MgI 5170 | 2, 3 |
| *5270 | 5235.0–5250.0 | 5260.0–5290.0 | 5305.0–5320.0 | Fe 5268 | 2, 3 |
| 5335L | 5304.6–5315.9 | 5312.1–5352.1 | 5353.4–5363.4 | Fe 5335 (Lick) | 1, 2, 3 |
| 5782L | 5765.4–5775.4 | 5776.6–5796.6 | 5797.9–5811.6 | Fe 5782 (Lick) | 1, 2 |
| *5895L | 5860.6–5875.6 | 5876.9–5909.4 | 5910.1–5925.1 | Na 5890 (Lick) | 2 |
| *5900b | 5790.0–5820.0 | 5840.0–5990.0 | 6040.0–6070.0 | TiO 5900 band | 3 |
| 6122 | 6068.0–6078.0 | 6114.0–6130.0 | 6198.0–6214.0 | CaI 6122 | 2, 3 |
| *6162 | 6068.0–6078.0 | 6156.0–6180.0 | 6198.0–6214.0 | CaI 6162 | 2, 3 |
| 6200M | 6105.0–6130.0 | 6143.0–6383.0 | 6520.0–6540.0 | TiO 6200 band | 3 |
| *6200bL | 6130.0–6150.0 | 6182.6–6272.1 | 6320.6–6352.1 | TiO 6200 band (Lick) | 3 |
| 6496 | 6470.0–6485.0 | 6485.0–6507.0 | 6510.0–6525.0 | blend 6496 | 2, 3 |
| *6563 | 6515.0–6530.0 | 6543.0–6583.0 | 6600.0–6620.0 | Hα | 1, 2, 3 |
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