def __init__( self, cal_directory_uris=["."], mode="local_disk" ):
     
     print ("Loading Calibration Service Available Directories")
     # calList will contain absolute paths/filenames
     self.calList = []
     for path in cal_directory_uris:
         for cpath in ConfigSpace.general_walk(path, [".fits"]):
             self.calList.append(cpath)