Volume[] indicator content

 

Does somebody know how MT4 fills the Volume indicator ?

When I compare the number of my broker-ticks in minute i

and I compare this with Volume[i]: it is not the same !

and there is only a lose relation (quotient)

 
In MetaTrader 4 Client Terminal, the volume of bar is the amount of ticks that have income during the bar forming. So, indicator Volume is based on the volume of bars.
Reason: