code: def create_from_position(cls, skydir, config, **kwargs):
          
  
          coordsys = kwargs.pop('coordsys', 'CEL')
          roi = cls(config, skydir=skydir, coordsys=coordsys, **kwargs)
          return roi
docs: Create an ROIModel instance centered on a sky direction.
  
          Parameters
          ----------
  
          skydir : `~astropy.coordinates.SkyCoord` 
              Sky direction on which the ROI will be centered.
  
          config : dict
              Model configuration dictionary.