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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