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Wrong historical data on chart? (GSK.L at 11th Feb, 2020)




Please look at the following chart.  It says that the lowest price for 11th Feb, 2020 is 179.18, which seems to be an error to me (the typical price range should be around 1700)



I checked the prices against  those from Yahoo! Finance, which is shown here.  Yahoo! Finance reports that the lowest price is 1703.40  For both charts I am focusing on the data for 11th Feb, 2020


I have a few questions:

1. Why would there be such an error in IG.com?  Can this be avoided and fixed?

2. Before the data is fixed, can I exclude that one day of data? Or, alternatively, can I change the scale of the verical axis so that the historical trend can still be visible? (Right now the trend is distorted because of thtat one erroneous data)

3. The other numbers are not totally identical - only the High Price are the same from the two sources (1742.60), the other numbers -- Open, Close, and Low are not at all the same.  Why?

4. I also noticed that the volume number also differ  -- IG.com reports 13,087,107 while Yahoo! reports 21.81M.  (Perhaps IG.com is reporting in number of shares but Yahoo! is reporting in GBP)?


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