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ADS1298RECGFE-PDK: Difference between ECG_SHD_DRV and ECG_RL pin on ADS1298RECGFE-PDK board?

Part Number: ADS1298RECGFE-PDK

Hi, 

 I would like to use the RLD drive to get rid of the extra noise in my system, but in ADS1298ECG-FE User's Guide I see to different port,  ECG_SHD_DRV and ECG_RL.

What is the difference between  ECG_SHD_DRV and ECG_RL and which of them I should use for RLD drive.

Thanks in advance.