Integrated charge validation

[YHRen]

Description

The integration of per-channel U and V waveforms over their sample time axis should be nearly zero due to the bipolar cancellation. The cancellation is imperfect due to the finite extent of the response model but should be O(1%). -- Brett

• per-event integrated charge vs channel.
• histogram of the per-event sum of this integral over the events of a dataset.
• scatter plots ?