tg_part
tg_part is either keyword or column in data products associated with the HETG or LETG data products. The numeric value indicates which grating arm the data in the file (keyword) or row in the file (column) represent.
| tg_part | Grating Arm |
|---|---|
| 0 | Zerth order (non-dispersed) |
| 1 | HEG arm of the HETG |
| 2 | MEG arm of the HETG |
| 3 | LETG |