Comments (1)
chris-simpson
commented on August 29, 2024
My first guess is that there's a column which has only one good pixel in it. The error doesn't arise when fitting a spline. The fitting is done by fit_1D() regardless of the type of fit, but the spline-fitter has explicit code to deal with cases where there are more degrees of freedom than parameters (hence the "Unmasking all data." messages). Since there's not a problem with other GMOS datasets (where there are chip-gap columns with zero good pixels), my guess is that this only happens with one good pixel. This would also explain why increasing the size of the regions works (additional good pixels are brought into that column).
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