Can you explain tick_volume and real_volume in struct MqlRates?

 
Can you explain tick_volume and real_volume in struct MqlRates?
 
tiankong:
Can you explain tick_volume and real_volume in struct MqlRates?
Tick volume is a count/number of price changes (statistics so to speak), whereas real volumes are market volumes (total size of contracts traded, amount). Real volumes can be unavailable (for example, on Forex, where there is no a centralized exchange).
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