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Data Integrity



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As far as data integrity is concerned which would be a solidly reliable real
time feed for the US equities market?  eSignal, DTN or Hyperfeed?  Also are
sat feeds more reliable then Internet feeds?  Lets keep the scope of this
question limited to the aspect of reliability ONLY please.
I logged into eSignal a few times, pulled up the same intraday charts, time
frame, etc.  Each of the time the data differed frequently and significantly
for Volume and negligibly for the other price data (Open, High, Low, Close).
Romi