docs: def add_moc_from_URL(self, moc_URL, moc_options = {}):
          """ load a MOC from a URL and display it in Aladin Lite widget
              Arguments:
              moc_URL: string url
              moc_options: dictionary object"""
          self.moc_URL = moc_URL
          self.moc_options = moc_options
          self.moc_from_URL_flag = not self.moc_from_URL_flag