code: def free(self):
          
  
          if self._coord_type == 'equatorial':
  
              self.ra.fix = False
              self.dec.fix = False
  
          else:
  
              self.l.fix = False
              self.b.fix = False
docs: Free the parameters with the coordinates (either ra,dec or l,b depending on how the class
          has been instanced)