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Text File  |  1999-10-23  |  172b  |  13 lines
  1. When a temperature inversion occurs 
  2.  
  3. When signals travel to the F region at night
  4.  
  5. When long-wavelength signals enter the D region
  6.  
  7. When tropospheric ducting occurs
  8.  
  9.  
  10.  
  11. 2
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