That's definitely an artifact from stitching multiple images. But I'm not sure why they would leave it that way since it's quite noticeable, but I guess there i

That's definitely an artifact from stitching multiple images. But I'm not sure why they would leave it that way since it's quite noticeable, but I guess there is always some debate on how much post-processing should they do on a scientific images and some people prefer closer to the raw capture even if it's not perfect.