At the point of impact on the surface of a planet (or capital ship in the case of death star 2) how wide is the laser(?) beam of the death stars' main weapons?
From what I can see on-screen, there is little significant difference between the beam sizes of the death star and death star 2, but if there is evidence to the contrary that I'm unaware of, I'm more interested in death star 1, which is also the one with more on-screen evidence, and seemingly the most easily measurable information, especially this frame from Rogue One.
I'm primarily interested in on-screen evidence, from feature length films, other sources should only be used as corroboration, not as the primary sources of the answers. EDIT In other words, if there is a source of information, separate from the films, that leads to an indication of this size, it should be used to confirm how on-screen images match that information, as opposed to being used to override or refute the on-screen images. The film-based information is not meant to exclude other sources of information entirely but, instead, to take priority over any information that contradicts the on-screen information.