Note, for S2, panels A and D (the correlation matrix plots) are NOT PDFs. Panel A was originally a TIFF and never a PDF due to extreme file size. Although the stand-alone Panel D file is a PDF, resizing the panel crashed kept crashing Illustrator, and after 5 crashes I gave up and inserted it into the overall figure as a PNG.
Closes #1324
This PR updates S2 and S4 with true PDF panels.
Note, for S2, panels A and D (the correlation matrix plots) are NOT PDFs. Panel A was originally a TIFF and never a PDF due to extreme file size. Although the stand-alone Panel D file is a PDF, resizing the panel crashed kept crashing Illustrator, and after 5 crashes I gave up and inserted it into the overall figure as a PNG.