The types section defines the names of the layers that will reside on each plane. Each line of this section contains a pair of names. The first name in the pair is the name of the plane to use. Each plane name must be defined in the planes section and thus this section must follow the planes section. The second name in the pair is the name of the layer to be placed on the plane. The second name can be a comma separated list of names all of which will be treated as the same layer. Contacts are not included in the section but are defined in the contact section.