List of Spectral Types of HPOL data
| B |
| A0 |
| A2 |
| A3 |
| A5 |
| B8 |
| B9 |
| F2 |
| F5 |
| F8 |
| G0 |
| G5 |
| K0 |
| K2 |
| K5 |
| M3 |
| M4 |
| O5 |
| WN |
| A0V |
| A1V |
| A2V |
| A3e |
| A5e |
| A7V |
| B0V |
| B1V |
| B2V |
| B3V |
| B4V |
| B5V |
| B8V |
| B9V |
| CII |
| F8V |
| G0V |
| G8V |
| M4e |
| M6e |
| O7e |
| O8V |
| O8e |
| O8f |
| O9n |
| WN5 |
| WN6 |
| A0IV |
| A0Vn |
| A0pe |
| A1pe |
| A2Vn |
| A3IV |
| A5II |
| A7IV |
| B0IV |
| B0Ib |
| B1+? |
| B1Ib |
| B1Ve |
| B2IV |
| B2Ve |
| B3Ve |
| B5Ib |
| B6Ib |
| B6Ve |
| B8Ve |
| B9Ia |
| B9pe |
| BO5e |
| B[e] |
| C... |
| C5II |
| F0Ia |
| F2IV |
| F2Ia |
| F3Ib |
| F5Ib |
| F6IV |
| F7II |
| F8Ia |
| F8Ib |
| K1IV |
| K3Ve |
| M3II |
| M4II |
| O... |
| O6pe |
| O7Ve |
| O9IV |
| O9Vp |
| S... |
| nova |
| A0III |
| A0Iab |
| A2+A5 |
| A2Iab |
| A3Iae |
| A7III |
| A7IVn |
| A8Iab |
| B0III |
| B0IVe |
| B0Iab |
| B1.5V |
| B1IVe |
| B1Vpe |
| B2III |
| B2Iae |
| B2Vep |
| B3III |
| B3IVe |
| B3Iae |
| B4III |
| B5IVe |
| B5Iab |
| B6III |
| B6IVe |
| B7III |
| B7IVe |
| B7Iae |
| B8III |
| B8Iab |
| B8Vpe |
| B9.5V |
| B9III |
| B9Vne |
| Bpshe |
| C7Iab |
| F2III |
| F4Ibp |
| F6Iab |
| G0Iab |
| G0Iep |
| G5III |
| G8Iab |
| K0Ibp |
| K1III |
| K5III |
| M1Iab |
| M2III |
| M2Iae |
| M3III |
| M3IIb |
| M4III |
| M4Iab |
| M5III |
| M6III |
| O6Iab |
| O9.5V |
| O9IIe |
| RVTau |
| WC7+? |
| WN6+? |
| A1IV-V |
| Apsh+M |
| B0.5IV |
| B0.5Ia |
| B1Iape |
| B1V+A0 |
| B1V... |
| B2.5Ve |
| B2.5pe |
| B2:III |
| B2IIIp |
| B2IV-V |
| B2IVne |
| B2Vnne |
| B3/B4V |
| B3IIIe |
| B6IIIe |
| B6Vnne |
| B7IV-V |
| B9.5IV |
| B9.5Ib |
| B9.5Ve |
| B9IV-V |
| CII... |
| F5IV-V |
| G2Ia0e |
| K3Ib+B |
| M1-2Ia |
| M2Iape |
| M7IIIe |
| O9.5Ve |
| O9.5pe |
| WN5+O6 |
| B0.5III |
| B0IV+B0 |
| B0V+B1V |
| B2IV-Ve |
| B9.5III |
| BIV+... |
| Be+F8II |
| M3IIIab |
| M5e-M9e |
| M7IIIpe |
| O9.5Iae |
| O9.7Oab |
| B1.5V+B5 |
| B1III-IV |
| B2II/III |
| B3V+A2II |
| B6.5IIIe |
| B7Ve+... |
| G0IV+G7V |
| G5III-IV |
| G8II-III |
| G8III-IV |
| M2Iab-Ib |
| M3/M4III |
| M3III:pe |
| M5II-III |
| M5Ib-II+ |
| M6IIIase |
| A7Iapevar |
| B0.5IIvar |
| B5Vnn+... |
| B8.5IV(e) |
| B8III+... |
| M1.5Iab-Ib |
| M2.5II-III |
| B7.7V+G8III |
| K5-M0Iab-Ib |
| O9III+O9III |