Which field of tick in ticker is volume change

So, we have a volume bar under price candle in charts, I want to know which field in a tick received from ticker is that volume, as the volume field is cumulative volume, it keeps on increasing through the day, but the volume bar under candle bar keeps on changing, I want to know if that volume is one of the fields or we could calculate it using the fields.
refer image.
Any info will be appreciated.
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