> Hi Ed,
>
> this is a known problem area for GAIA. What you've got is a mapping that
> is using a lookup table for the 54000 coordinates in your third dimension.
> To pass these around in the Skycat layers it is necessary to feed these
> into and back out of a FITS encoding, that's where all the time is going.
>
> The best way around this is to use a linear mapping if you can.
OK, thanks for the response. The fact that it is slow for one data cube
but not another (which in theory have identical dimensions/tswcs) means
that there must in fact be a difference between the tswcs of the two
cases.
Hmm...
Ed
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