I have placed plots in one column and two rows using gtl layout overlay. The plots share the same
axis so I have joinde them using columndatarange = union. The x axis of the upper plot and the x2 axis of the lower plot are right next to eachother, so it makes the line double width there (I have attached a snip of the place where the two plots meet). This double line is kind of a distraction in the middle of the figure: How can I remove one of the lines or have one of them be transparent so only one line appears there?
3) Which version of Sas are you currently using? The options for the graphing procedures have changed/increased with each release for quite awhile. It won't help you to get a suggestion relying on SAS 9.4 options if you are usingin 9.3.
These are not axes lines, but the wall borders of the two independent cells. You can try turning off one of the wall borders, but you will remove the entire border around the cell. It may better to leave a little gutter for aesthetic appearance, but that is up to you. If you must remove the extra line, you will have to annotate a line with wall color exactly on top of one of the border lines.