Thanks for the update, Ron. [Edit: 'Rob' .. not 'Ron' ...apologies to both for that].
Very interesting .. the plot thickens, eh ?
Accurate measurement of the transit time (or length) of the optical fibre between the receiver and the data collection point would seem to be a good idea ... all sorts of strange things can happen in systems between where data is generated, (in this case the receivers underground), and the data aggregation point. I haven't the foggiest idea about what an RPC is, but this may introduce other errors/discrepencies (??).
Oh well, looks like Mr Stanco is taking it 'slow and steady' .... mind you, it does start to look more exciting with each confirming development, eh ?
Cheers
PS: Ooops !! I mean thanks for the update,
Rob ... not Ron. Apologies to both for the typo ...