Since graphic depiction guides a lot of interpretation, here an alternative (I have taken the liberty to modify
peekay's (#200) graph).
In grey, the envelope for the data, darker where three stations, lighter grey where two.
For demonstration, added in yellow a - completely hypothetical - possible flight path that would be perfectly consistent with the given data.
The data tell that the aircraft was climbing first, and then descending (no surprise).
(note that the data is only what the onboard computers thought it was, not necessarily what it was (no matter how well -or rather not- synchronized); and we do not know how wide the "envelope" really should be).