Text this: Background condition effect and modified SOM with frequency hopping applied in inverse scattering

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