Polygons# NCL_polyg_18.py NCL_polyg_18.py NCL_polyg_19.py NCL_polyg_19.py NCL_polyg_2.py NCL_polyg_2.py NCL_polyg_4.py NCL_polyg_4.py NCL_polyg_8.py NCL_polyg_8.py NCL_polyg_8_lbar.py NCL_polyg_8_lbar.py