AD7793 FS error specification

The AD7793 Full-Scale error specification has a footnote (3) that states " Following a calibration, this error is in the order of the noise

for the programmed gain and update rate selected".

Is the calibration that is noted in the footnote 3 referring to the "Internal Full-Scale Calibration" or the "System Full-Scale Calibration". I suspect it is the System Full-Scale Calibration but would like to know for sure.

Thanks.