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ADS1299 EEG-FE single ended input settings

Hi,engineers:

I'm currently working with the ADS1299EEG-FE PDK by single ended inputs. Then, whether should I leave pins 35, 31, 27, 23, 19, 15, 11, 7 exposed to air directly or connected something when I provided the single ended inputs to pins 36, 32, 28, 24, 20, 16, 12, 8 of J6 for channels 1-8 respectively?

I'm looking forward to your reply!

Thanks!