Mistakes were made...camera orientation.
This is what happens when you are doing a mosaic and have a night between imaging sessions then forget to reorientate the camera before starting the second night.
The 2 panels on the left are the first night and were vertically aligned (see 2nd image). The other 2 panels should have been off the right of the first two, but the camera was rotated about 90° so a wasted session.
You live & learn...
Cheers,
Mark
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