Dear all,

I’m working on a project of ultra-precise micro-arcsecond relative astrometry space observatory (Theia). 

Especially, I need to map the image plane (0.5°x0.5°) with a very high accuracy. For instance, I have to study the variations of positions of the PSF (with CENX/CENY) due to some perturbations (distortion, tilts of the mirrors...).

By default, the number of fields is limited to 2025 for my premium version, but I would need 100x100 fields.

It’s rather easy to generate such a new grid, but the parameter “i” (field number) of CENX/Y refers to the (default) field table.

Is there a way to use CENX/Y with this new grid ?

Many thanks,

Thierry.