Since you ask...
I initially made it in Excel. I typed in the formulas with a leading ' which made Excel display them literally. I used Excel's "border" tool to make the border.
Then I opened up a new message in Outlook 2000. I set the mail format to HTML, and copy/pasted from Excel to the mail message.
Then I right-clicked the message and "View Source"d.
Then I copied the HTML from <table> to </table>.
Then I went to Channel 9, replied to your post, and switched to the "HTML" tab in the FreeTextBox editor.
Finally I pasted the HTML I had copied.
To post images... first I got a free Geocities account (www.geocities.com)
I save the image in gif or jpg format and upload it to my account
Then I open the image at the geocities URL in another browser window
Finally I drag and drop the image into the FreeTextBox editor.
To transfer files, you could .zip the file up and post it on your Geocities account. Then you could post a link in your comment.
Finally... to add more stops, you could add more columns. The formulae get a little more complicated, but ten stops shouldn't be impossibly difficult.