What are the lines in the waterfall chart

In the waterfall chart of network requests, there are some vertical lines marking progress, e.g.:
Two greenish lines, and a pink one (which is sometimes wider), and at the end a blue one.
What are these? Didn’t find any info in documentation.
Thank you!

They’re in the legend at the top of the normal waterfall view - http://www.webpagetest.org/result/151019_YN_1bfda2434b203d30f7beb1f1cdc8e8e8/1/details/

Oh yes, I see, thanks!