Hi! What do the first two buttons under the collimator screen mean/do (the arrow squiggly one and the M)? The techs at clinical said they don't really use them, but I need to know for my homework, and couldn't find anything online. Thanks! (Sorry for bad quality)

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source https://www.reddit.com/r/Radiology/comments/je9pjj/hi_what_do_the_first_two_buttons_under_the/