![Automate the placement of reference lines in PROC SGPLOT](https://blogs.sas.com/content/iml/files/2020/11/RefLineAuto1-640x336.png)
The REFLINE statement in PROC SGPLOT is one of my favorite ways to augment statistical graphics such as scatter plots, series plots, and histograms. The REFLINE statement overlays a vertical or horizontal reference line on a graph. You can specify the location of the reference lines on the REFLINE statement.