In my opinion, PostScript is superior, so I always give the PostScript link first. If you're using a school computer or some other computer with default software installed, then you probably don't have a PostScript reader. But if you can install software on your computer, then I encourage you to download Ghostview, which is available for Windows, Macintosh, Linux, and other systems. (Note that you need to download and install two separate programs, GPL Ghostscript and GSview; these are both available from the same web site.)
Alternatively, you can read the PDF version. With any luck, you already have a PDF reader installed; if not, you can download Adobe Acrobat Reader, which is available for Windows, Macintosh, Linux, and other systems. (This website will try to give you a Photoshop program too, but you don't need that, so uncheck the box if you don't want it.) However, I don't think that this format (or the program) is as good, so if you must download something, then I'd use PostScript and Ghostview if I were you. The only reason to prefer PDF and Acrobat Reader is if your computer already has Acrobat Reader installed.
Of course, there are PostScript and PDF files elsewhere on the Internet, so you may as well install both of these if you want a computer that can do everything.
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