Keywords: mrtcal-prog-manual

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## Projection system

The antenna offsets are expressed in a system described by the card `SYSTEMOF` in the Antenna HDU. If its value is:

- `projection`, this means the offsets are radio-projected in the current coordinate system, i.e. the system found at ; the offsets can be used ``as is'' in CLASS,
- something else, e.g. `horizontalTrue` for `calSky`, the offsets are not expressed in the correct frame and should be recomputed to the desired sky coordinate system (CLASS does not offer the possibility to express the reference in one system and the offsets in another). ZZZ this is not yet implemented, warning for now.