new_contents: import os.path
  
  from msschem.models import CAMSRegDriver
  from msschem.download import CAMSRegDownload
  
  register_datasources = {
      'CAMSReg_ENSEMBLE': CAMSRegDriver(
          dict(
              dldriver=CAMSRegDownload(
                  token='MYTOKEN',
                  modelname='ENSEMBLE'),
              force=False,
              basepath=os.path.expanduser('~/tmp/mss/data/'),
              name='CAMSReg-ENSEMBLE',
              temppath=None,
          )
      )
  }
  
subject: add settings file