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Have you tried right clicking and choosing the inspect option? In the elements tab, you can highlight a piece of code and it will show you the pixel size on the page you are looking at; it shows up on the upper left side when you highlight a piece of code.
doing this i have seen that the news stream of a space in my agency is 645 x 3251 px, and the whole page (minus the banner at the top of the page) is 985 x 3271. I couldn't see the tiles side of the page though.
Hope this helps!