I downloaded SPICE model of AD8232 and tested it with NI Multisim 14.
Here is my circuit:
Here is frequency response:
I ran AC Sweep with RA as input, LA and RL are grounded (as while testing Fig. 62 and 64), frequencies as on your plots.
I compared my circuit with Fig. 66 many times, so I'm almost sure I do not have any error here.
Where am I wrong?
With best regards,