Thanks. That works very well.

Nick James

Thanks. That works very well. I get a pretty good ensemble fit against Gaia G and a magnitude for SN 2021hpr of 14.21. This compares to 14.29 using my aperture photometry tool, presumably affected by the galaxy background. I think the SNR you quote is too low though. I get 168, you have 27. SNR is a difficult thing to calculate correctly. How do you do it?