Yep I see your plots which come up as 'oX'; I have 2 pc's and run SBS on one and radarbox on the other where I also supply acars (user kJ).
1000' seperation is standard from what I can see on the Nav charts with odd/even heights established for a/c in opposite directions.
On a slightly different scenario is where a/c 'follow' each other at the same alt. I get the afternoon departures to the west and you have maybe 3 to 4 a/c following each other all at say FL350.
Remember the old 'cliche' that if you were a 747 pilot you didn't want to get 'stuck behind' an A340 as they used to cruise quite a few knots slower.
(I think it was Mach 0.86 for the 747 and 0.82 for the A340 but this was not always the case)
I always remember the 747's requesting a higher/lower altitude so they could 'pass' the A340. It would take a fair while to pass but the ATC comms where interesting to listen to.
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