text: ''' Set grs absolute path and global variables'''
  
  import os, sys
  from .__init__ import __version__ as VERSION
  from .__init__ import __package__
  
  root = os.path.dirname(os.path.abspath(__file__))
  
  # set gpt from snap (usually in your snap folder e.g., path_to_snap/bin/gpt)
  gpt = '/local/AIX/tristan.harmel/snap/bin/gpt'
  
  # -----------------
  # please set the following path according to your specific file tree
  # grs_root = os.path.abspath('/DATA/S2_processing/PYTHON/grs/grs')
  grs_root = root
  
  # data_root = os.path.abspath('/DATA/S2_processing/PYTHON/grs/grs/../..')
  data_root = os.path.abspath('/nfs/DD/grsdata')
  # directory to store temporary unzipped files
  tmp_dir = os.path.abspath('/nfs/DD/grsdata/tmp')
  lut_root = os.path.join(data_root, "LUT")
  cams_folder = os.path.abspath('/nfs/DP/ECMWF/CAMS')  # os.path.join(data_root, "CAMS")
  smac_root = os.path.join(data_root, "SMAC_COEFS")
  
  # -----------------
  # do not change:
  fortran_root = os.path.join(root, "fortran")
  sys.path.insert(0, fortran_root)