SAS Stationarity PACF question

[adrfinance]

Hello,

I am looking at the following web page regarding stationarity:

https://documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=etsug&docsetTarget=etsug_...

I have two questions:

First of all, what do the shaded blue-ish lines mean for the PACF plots etc? Are these some kind of confidence intervals?

Also, in order to assess stationarity, do I need to plot the ACF and PACF and then keep as many lags as those that exceed these blue-ish lines?

[Ksharp]

Please post it at Forecasting Forum since it is about SAS/ETS .

[adrfinance]

Ok I posted it there thanks.