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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