On several independent occasions, I've had data where the continuum is bright enough to self-calibrate, but the lines aren't. In these cases, I want to apply the continuum-derived selfcal solutions to the line data.

In all of these cases, I have several independent execution blocks that I've split and downsampled before combining to make the continuum image.

I got stuck trying to make this happen, but we reconvened on the topic in early 2021, and Manuel Fernandez and Roberto Galvan-Madrid and I came up with this tool to match spectral windows in a concatenated data set to the appropriate windows in the original: https://github.com/ALMA-IMF/reduction/blob/master/misc/applycal_tests.py