If a CmpMap's component Mappings are joined in series, then
its Nout attribute is equal to the Nout attribute of the
second component (or to the NinNin attribute of the first
component if the the CmpMap's InvertInvert attribute is non-zero).
If a CmpMap's component Mappings are joined in parallel, then
its Nout attribute is given by the sum of the Nout attributes
of each component (or to the sum of their Nin attributes if
the CmpMap's Invert attribute is non-zero).