Question: "For some channels from the beginning of the band,
I get visibility values far away from where we would expect them and in many
cases they have negative values. What is happening?"
Answer: The strange visibilities are usually at the very beginning of the K band, where there is some contamination by the H band (meaning that the fringe pattern given by the P2VM cannot be reliable). You should restrict your domain to a smaller wavelength range. Checking the P2VM with amdlibShowP2VM would be a good idea to see the possible overlap.
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