Have an explanation for all those bars on the website

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I like weekplan.net, but there are a bunch of bars that are grey and filled in with some other colour. I figured out, for instance, that the one at the top of the week is just tracking the time. However, I still don't know what the bars above my roles are, and there's a few more I've seen on the website.
App:
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Aymeric Founder
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Aymeric Founder
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You can find a video on momentum bars on this page: http://weekplan.net/tutorials/