PROC SGPLOT color between 2 reference lines

[PamG]

I would like to add a vertical color band between 2 reference lines.  A code is attached below.  Basically I would like the area between X=40 and X=50 to be shaded with some transparency.  I tried REFLINE but there doesn't seem to be an option to color the area between them.

proc sgplot data=sashelp.Heart;
   Scatter X=AgeAtstart Y=Cholesterol;
   refline 40 50 / axis=x lineattrs=(thickness=3 color=darkred pattern=dash)
                     label=("Borderline"  "High"); 
run;

[Ksharp · Accepted solution]

proc sgplot data= sashelp.Heart;
   band y=Cholesterol lower=40 upper=50/transparency=0.6;

   Scatter X=AgeAtstart Y=Cholesterol;
   refline 40 50 / axis=x lineattrs=(thickness=3 color=darkred pattern=dash)
                     label=("Borderline"  "High"); 
run;

[PamG]

Thanks so much @Ksharp !!!

[Rick_SAS]

As KSharp shows, use the BLOCK statement. In addition to the example he provides, see Highlight forecast regions in graphs - The DO Loop (sas.com)