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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
        
         
          
           | Description | 
           
            English: This is modification of a synthetic atmosphere absorption spectrum (Stick spectrum) for a custom (user defined) gas mixture containing:H2O: 0.002000 CO2: 96.500000 CO: 0.017000 SO2: 0.015000 HF: 0.000000 HCl: 0.000035 N2: 3.500000 % generated using Hitran on the Web Information System  http://hitran.iao.ru/  (Harvard-Smithsonian Centre for Astrophysics (CFA), Cambridge, MA, USA and V.E. Zuev Insitute of Atmosperic Optics (IAO), Tomsk, Russia).  
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           | Date | 
           13 August 2012 | 
          
          
           | Source | 
            http://hitran.iao.ru/ | 
          
          
           | Author | 
           Hitran on the Web Information System (Harvard-Smithsonian Centre for Astrophysics (CFA), Cambridge, MA, USA, V.E. Zuev Insitute of Atmosperic Optics (IAO), Tomsk, Russia) and  Darekk2 | 
          
         
         
        Licensing 
        This image is modification of a synthetic Stick spectrum of a custom (my) gas mixture I created using Hitran on the Web Information System  http://hitran.iao.ru/ (Harvard-Smithsonian Centre for Astrophysics (CFA), Cambridge, MA, USA V.E. Zuev Insitute of Atmosperic Optics (IAO), Tomsk, Russia). They state on their webpage:
 Usage agreement
 Users of the Hitran on the Web Information System agree to reference it in scientific publications, presentations and communications if the system is useful for their investigations.
        
         
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           I, the copyright holder of this work, hereby publish it under the following license:
           
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       File usage
       
        The following pages on Schools Wikipedia link to this image (list may be incomplete):
        
        
       
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