text: #snapshot parameters
  
  snapnum_str = '59'
  hydro_dir = '/blue/narayanan/desika.narayanan/yt_datasets/TNGHalo/'
  
  galaxy_num = 0
  galaxy_num_str = str(galaxy_num)
  
  snapshot_name = 'halo_59.hdf5'
  
  #where the files should go
  PD_output_dir = '/home/desika.narayanan/pd_git/tests/SKIRT/arepo_cluster/'
  Auto_TF_file = 'halo_59.logical'
  Auto_dustdens_file = 'halo_59.dustdens'
  
  
  #===============================================
  #FILE I/O
  #===============================================
  inputfile = PD_output_dir+'/pd_skirt_comparison.'+snapnum_str+'.rtin'
  outputfile = PD_output_dir+'/pd_skirt_comparison.'+snapnum_str+'.rtout'
  
  #===============================================
  #GRID POSITIONS
  #===============================================
  x_cent=48669.34
  y_cent= 53984.04
  z_cent= 62114.9028077
  
  #===============================================
  #CMB
  #===============================================
  TCMB = 2.73
  