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 _    _      ___               __   __   ______   
| |  | ||   / _ \\    ____     \ \\/ // |      \\ 
| |/\| ||  / //\ \\  |    \\    \ ` //  |  --  // 
|  /\  || |  ___  || | [] ||     | ||   |  --  \\ 
|_// \_|| |_||  |_|| |  __//     |_||   |______// 
`-`   `-` `-`   `-`  |_|`-`      `-`'   `------`  
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Text this: A high-brightness large-diameter graphene coated point cathode field emission electron source