[MANGO] GAIA implementation example

[CresitelloDittmar, Mark]

Laurent,

I'm following up on the GAIA implementation example, and have a question.

The example file is linked from the twiki, which I've given feedback on.

Is there a notebook which shows your software using it for the epoch
propagation workflow?
I see the  notebook from the Sydney demonstration
<https://github.com/ivoa/dm-usecases/blob/main/notebooks/sydney.ipynb>
 which:
   - loads the GAIA file
   - displays its contents, an EpochPosition instance in different forms.
   - then pulls content from Vizier which is converted to SkyCoords, and
used in epoch propagation.

The Vizier query looks like the Vizier example, so I'm guessing this either
is, or is similar to the Vizier example?

I'm looking for the workflow that informed the formation of EpochPosition,
EpochPositionCorrelations and EpochPositionErrors.  I think it'll be
important to have that in the twiki as well when this gets a broader
review.

Mark
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