Historical Chart Data is the data you receive when you log on to a live data provider and download data for the chart.
Market Replay Data is a data that is designed for forward playback.
On those days that you load a chart and it shows the automatic chart backfill, that is Historical Chart Data.
You would need to connect to a live data provider and load a chart for the same period that you wish to replay to download the Historical Data to your chart.
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