Text this: Generic exponential bounds and erfc-bounds on the marcum Q-function via the geometric approach

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