how to calculate volume from last tick on zerodha?

if I am understanding it correctly then vol_trades gives total vol of the day, but on ticks i am getting in some it LTP changes but the volume remains the same
example-{‘time’: datetime.datetime(2026, 5, 4, 15, 9, 47), ‘ltp’: 208.45, ‘vol’: 138748480}
{‘time’: datetime.datetime(2026, 5, 4, 15, 9, 47), ‘ltp’: 208.75, ‘vol’: 138748480}
{‘time’: datetime.datetime(2026, 5, 4, 15, 9, 48), ‘ltp’: 207.6, ‘vol’: 138748480}

is there is better to know the volume traded from last tick?

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