docs: def add_moc_from_dict(self, moc_dict, moc_options = {}):
          """ load a MOC from a dict object and display it in Aladin Lite widget
              Arguments:
              moc_dict: the dict containing the MOC cells. Key are the HEALPix orders,
                        values are the pixel indexes, eg: {"1":[1,2,4], "2":[12,13,14,21,23,25]} 
              moc_options: dictionary object"""
          self.moc_dict = moc_dict
          self.moc_options = moc_options
          self.moc_from_dict_flag = not self.moc_from_dict_flag