Pyadi-iio Received Data Format on ADRV9361-Z7035

We have been able to transmit and receive data on the same ADRV9361-Z7035 using a modified version of the provided sample Python code.  Qualitatively, the received data looks good and matches the transmitted data, but we are having difficulty understanding the format of the received complex data.  What exactly do the real and imaginary parts of the data represent, and how can I process the received samples into usable data?  Where could I read more about the data format used by the Pyadi-iio library, or the hardware itself?

Thank you.