Nodes of different colours represent the following:
Solid arrows point from a parent (sub)module to the submodule which is
descended from it. Dashed arrows point from a module being used to the
module or program unit using it.
Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.