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                              Reference:  Dobrijevic et al. 2020
 
  
                                Model 1 Neutral model (A1)
  
                                Model 2 Ion-Neutral model (A2)
  
                                Model 3 Ion-Neutral model (B1)
  
                                Model 4 Ion-Neutral model and Comet impact (5 years)
  
                                Model 5 Ion-Neutral model and Comet impact (50 years)
  
                                Model 6 Ion-Neutral model and Comet impact (100 years)
  
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