It's not an image, it's HTML text formatted using the
BBCode feature of this web site.
Under the current configuration, the only person who can post images directly is the site admin, he has disabled the capability for ordinary users (I'm not complaining about that, it's probably a good idea).
You could use a site like
http://imgur.com/ to upload your image, and then post a link to imgur here.
The problem with the BBCode approach I used is that it still tries to wrap long lines. I start by printing my selection from Excel to the Windows generic/text printer, which produces a .TXT file with fixed-width space characters to achieve tabular formatting. But even then, I find I still have to tweak the text a few times to get it to look presentable.