PointingXds: POINTING_BEAM

[kettenis]

The description says "optionally expressed as polynomial coefficients" but I don't see how the specified dimensions allows this.

[FedeMPouzols]

Yes, thanks for catching this. The optional dimension n_polynomial is missing in the table.
The optional dimension n_polynomial is included in the schema but it is not being propagated to the spec tables by the code that pulls that information. It seems we never listed n_polynomial as a coordinate and that seems to confuse the code. I suspect we'll have to define a PointingBeamArray class or similar, also to keep the ordering of dimensions, as n_polynomial is in principle the last one.