historical data and tick volume question

 

may i know where can i find a high quality historical data source of forex pair up to 1min period?

and how to interpret the tick volume in different levels of bid/ask depth? does it mean the number of times of the offer/size changes in a small time interval, so it represents how frequent people revise their order size of a bid/ask price?

 
alex2019trading:

may i know where can i find a high quality historical data source of forex pair up to 1min period?

and how to interpret the tick volume in different levels of bid/ask depth? does it mean the number of times of the offer/size changes in a small time interval, so it represents how frequent people revise their order size of a bid/ask price?

Where do you see "the tick volume in different levels of bid/ask depth?" Volumes by levels are available in order books only, which are not provided for forex symbols usually.