What does the "Payment" amount and time stamp represent in the hourly report graph?

[SingleSpeedCafe]

On the Sales page of Dashboard is the Hourly Sales trend graph. When one hovers over each hour, Square shows a total "Payment" amount. Is this amount total collected? Gross? Net? Super important to know, especially in a state with 11% sales tax!! 

Question 2: When hovering over a time, say 12pm for example - is the "Payment" amount from 11am to 12pm or the sales from 12pm-1pm? 

[VanKalkerFarms]

the total shown is the subtotal, so not including tax.

as for the time period, it is the 12 o'clock hour meaning 12-1.