Nick, I am using SNR = Peak

Maxim Usatov

Nick, I am using SNR = Peak Flux at the centroid / Median Sky Background Level, where Peak Flux is taken from the raw FITS data, and not estimated from the photometric fit, and the sky background is taken over the entire image. Do we need any adjustments here? I wonder how 168 was derived.

Note I was able to improve the uncertainty by limiting the ensemble range to 13-16 mag – see attachment.