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To facilitate the new capabilities of the MWAX system, a few new key/value pairs have been added to the metafits file format. Default values can be assumed, in the absence of these new key/value pairs.
| Key | Values | Default (if not present) | Notes |
|---|
| DELAYMOD | - "NODELAYS"
- "CABLE"
- "TILEBEAM"
- "FULL"
| "NODELAYS" | Human readable representation of the delay mode. |
| DELDESC | - "No delays applied"
- "Apply cable delays and phase to zenith"
- "Phase up to primary beam pointing direction"
- "Phase to source with real-time calibration"
| "No delays applied" | Human readable description of the delay mode. |
The above key/values are shorthand for specific settings of 3 new keys describing how delay corrections are handled:
| Key | Values |
|---|
| CABLEDEL | |
| GEODEL | - 0 == off
- 1 == zenith
- 2 == tile-pointing
- 3 == az/el table
|
| CALIBDEL | |
The DELAYMOD thus determines the above 3 setting values:
| DELMOD | DELDESC | CABLEDEL | GEODEL | CALIBDEL |
|---|
| NODELAYS |
| 0 | 0 | 0 |
| CABLE |
| 1 | 1 | 0 |
| TILEBEAM |
| 1 | 2 | 0 |
| FULL |
| 1 | 3 | 1 |
| Key | Values | Default (if not present) | Notes |
|---|
| RAWSCALE | floating point | 1 | The multiplier that was used by the MWAX correlator to scale raw visibilities down to Janksy-like units |