Modified GADGET-2 to support HDF5>=1.10. Below is the original README.

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GADGET-2   -  A code for collisionless and gasdynamical  
              cosmological simulations                   
                                                         
      (GAlaxies with Dark matter and GasintEracT)        
       --            -               -     -   -         
      	                                              
written by:   Volker Springel, MPA, (c) 2005             

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Please see the files in the directory `Documentation' for a detailed discription of this simulation software. There you should find the following files:

gadget2-paper.pdf - Discusses algorithmic aspects of the code

users-guide.pdf - Instructions for code usage

In addition, please use your browser to access the cross-referenced documentation of the source code, contained in the html/' subdirectory (open the index.html' file).