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   _____     ___      _  __     ___     _    _   
  / ___//   / _ \\   | |/ //   / _ \\  | \  / || 
  \___ \\  | / \ ||  | ' //   | / \ || |  \/  || 
  /    //  | \_/ ||  | . \\   | \_/ || | .  . || 
 /____//    \___//   |_|\_\\   \___//  |_|\/|_|| 
`-----`     `---`    `-` --`   `---`   `-`  `-`

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Text this: Optical emission spectra of a copper plasma produced by a metal vapour vacuum arc plasma source