Disclaimer: this is probably not an issue in pygac, but because it involves pygac and because of a lack of other place, I would like to have the discussion here.

@helgaweb has brought to my attention four passes from metops A and B where there is a consistent shift in x-direction. Since these are considered KLM satellites, there is no correction applied to the navigation by pygac (or satpy for that matter), so we are wondering where this can come from. @sfinkens @carloshorn any ideas? Attaching some images so you can see.