What convention are associated with section lines?

* Solid thick lines: These are used to indicate the outline of an object.

* Solid thin lines: These are used to indicate internal details of an object.

* Dashed lines: These are used to indicate hidden features of an object.

* Dotted lines: These are used to indicate center lines or axes of symmetry.

* Chain lines: These are used to indicate the outline of an object that has been removed or cut away.

* Phantom lines: These are used to indicate the outline of an object that is to be added or installed.

* Break lines: These are used to indicate the location of a break in a section view.