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

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發送短信 : EM fields inside a prolate spheroid due to a thin circular loop: A higher-order perturbation approach