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BAD SPY print for 9/15/16 on morning of 9/19/16

I'm still looking into this, but it seems that my algo got a wrong value for the 9/15/16 SPY close today. I get the historical values like this:

 prices = data.history(context.spy, 'price', 3, '1d')

The value I apparently read was close to 214.23, but the correct value is 215.28.

Did anyone else happen to have the same experience?

Thanks!

Robert