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Text File  |  1999-10-23  |  140b  |  13 lines
  1. A temperature inversion 
  2.  
  3. Lightning between the transmitting and receiving stations
  4.  
  5. An aurora to the north
  6.  
  7. A very low pressure area
  8.  
  9.  
  10.  
  11. 4
  12.  
  13.