diff --git a/polygon/EfficientClippingPolygons.pdf b/polygon/EfficientClippingPolygons.pdf deleted file mode 100644 index e7156785d6..0000000000 Binary files a/polygon/EfficientClippingPolygons.pdf and /dev/null differ diff --git a/polygon/robust_polygon_modelling.pdf b/polygon/robust_polygon_modelling.pdf deleted file mode 100644 index 667559692d..0000000000 Binary files a/polygon/robust_polygon_modelling.pdf and /dev/null differ