I expect that the offset is calculated by using close (settlement) prices of the session prior to rollover. Rollover date for ES 12-10 was September 9 , so I look at the settlement prices from September 8:
ES 09-10 (source Kinetick) 1099.25
ES 12-10 (source Kinetick) 1094.50
The offset should be -4.75, however NT7 has calculated an offset of -5.00.
How can this be explained?
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