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To answer the question: Yes, there is a way. Use a bright but unsaturated star. That might already be good enough, or you might want to do any number of corrections to this PSF model. A better way is to figure out the parameters to use with TinyTim, and generate an approximately right PSF from those. Most parameters you know, or they are easy to look up, ...


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What instrument was used to take the data? This page has PSFs for WFC3.


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