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CN0549 - How to acquire samples continuously?

I've run the example python code from https://github.com/analogdevicesinc/pyadi-iio/blob/master/examples/cn0549/collect_data.py

The question I've been unable to answer is how samples are returned by xl.rx().  Do successive calls return successive 4096-sample frames of data with no overlap or gaps between frames?  If not, how is this done?