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[amibroker] Yahoo Historic Data Discrepancy



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I am trying to load the etf, PTF, with past data from yahoo historic. The web site shows data back to 12-Oct-06.  However, when I download using AQ, the data goes back to 10/24/2000 and stops at 7/14/2006. Its clearly an old ticker that has been given new data. I have deleted the ticker and reloaded to no avail. Any idea why yahoo historic web site does not agree with the AQ download? Am I doing something wrong?
Thanks
Dave

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