Under the 'CI area' I mean smth. like the one plotted on graphs in @cbeleites' answer or depicted in Ron Pearson's post.:
Thank you.
I'm in a hurry to show my way to do this:
PROC SGSCATTER DATA = myData;
PLOT variable1*variable2 /
GRID REG = (DEGREE = 1 LINEATTRS = (THICKNESS = .25 pt) CLM CLI NOGROUP);
RUN;