Visualization of AʹCampoʹs fibered links and unknotting operation

AʹCampo formulated the way to construct a link in the 3-sphere from so-called divides, i.e., immersions of copies of 1-manifolds in a disk. Links obtained from isolated singularities of complex hypersurfaces are obtained from divides, but not vice versa. He proved that any link obtained from a connected divide is a fibered link, and calculated the unknotting numbers of such knots. In this article, we give a quick method to draw the diagrams of the link of the given divide, together with the fiber surface. By visualizing the knots of divides, we can calculate the unknotting numbers for some knots which do not come from a divide.