Scope connection inputs when performing SPC

We are performing SPC periodically, and per manual, it is asking to remove all input cables. I want to ask if you could give a bit more definition on what "input" means? Besides CH1, CH2, CH3, CH4, is necessary to remove cable connection to AUX IN, AUX OUT, and REF IN? Thanks

Yes, it is recommended to remove the connections from Aux In, Aux Out, and Ref In.