Data discrepancy - between ProRealtime and REST API

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Data discrepancy - between ProRealtime and REST API

Hi.

Using the REST API for OHLC data and compare it with ProRealtime Graphs shows discrepancy in data. According to IG support this is due to REST API delivers [last traded price] meanwhile ProRealtime shows mid price.

Question:
Anyone knows how these 2 tools could be synchronized?
I am setting up streaming API also but would like to be able to use ProRealtime graphs for confirmation tests that graph matches API data.