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  This is confusing me: I use Pinnacle EoD data but my broker's trading
  platform (PFG BEST Direct) reports from some other data source and there
  are differences between the reported OHLC values of each for some
  markets.

  Some prices match fairly closely while some are miles away.
  The following are Monday's prices, all DEC contacts:
  
  10yr T-Notes seem miles out
  PFG OHLC of:    110.240/110.245/110.235/110.235
  Pinnacle TY:    110.531/110.969/110.391/110.781 (to 3 decimal places) or
                  110^34 /110^62 /110^25 /110^50  (as 64ths)

  T-Bonds do too
  PFG OHLC of:    113.3  /114.0  /113.29 /113.3
  Pinnacle US:    113.31 /114.25 /113.19 /113.97  (to 2 decimal places) or
                  113^10 /114^08 /113^06 /113^31  (as 32nds)

  Cotton is reasonably close
  PFG OHLC of:    60.25  /61.29  /60.13  /61.10
  Pinnacle CT:    61.00  /61.25  /60.65  /61.00

  British Pound is a bit further out
  PFG OHLC of:   201.92 /202.29 /202.16 /202.18
  Pinnacle BN:   202.40 /202.82 /202.13 /202.25

  Euro
  PFG OHLC of:   138.41 /138.45 /138.21 /138.21
  Pinnacle FN:   138.14 /138.53 /138.03 /138.42

  I am confident that the Pinnacle data is as accurate as it can be, which
  is to say accurate in relation to the actual markets as reported by the
  respective exchanges - I have checked this very carefully. On the other
  hand I cannot get the PFG data to match any market exactly.

  OK, that is the problem: now - will it affect me?
  
  When I place a trade the person executing the trade for me would
  presumably be at the relevant exchange and would place my stops in
  relation to the market, and not in relation to the PFG data.

  If this is the case does it matter that my broker reports the
  PFG data OHLC? I suspect that it does not matter but I would
  appreciate others views on this. Thanks in advance.

-- 
Warm regards,
 Roscoe                          mail to: Roscoe@xxxxxxxxxxxxxx