Fig. 2
From: Coupling library Jcup3: its philosophy and application

Data exchange diagram. The gray circles represent masked value. Therefore, only the grid point value indicated by the blue circle is passed from component A to component B
From: Coupling library Jcup3: its philosophy and application
Data exchange diagram. The gray circles represent masked value. Therefore, only the grid point value indicated by the blue circle is passed from component A to component B