This is actually around equinox time, and got me thinking, I wonder if this could be something to do with TEP
So I dialled up a few of the other Japan stations stats pages, and interestingly, this is what I saw -
As you can see and which I have highlighted in red circle, there are a number of peaks in the zone of approx 3000 nm, which equates to around 5600 km. This is close to the distance indicated on the initial map of station 594.
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