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

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Text this: Sigma chromatic numbers of the middle graph of some families of graphs