A mask having a mask pattern for properly evaluating pattern line width. The output side of each edge node preferably connects to a large number of core switches through individual time-locked channels and the input side preferably connects to each of a small number of core switches through a channel band having a sufficiently large number of channels. The cup-dispensing unit comprises a flexible gasket or other cup retaining means that retains the last of a stack of cups in place, against an opposing cup-advancing force developed within the cup-dispensing unit. The intermediate region having a movable door by means of which manual interventions in the processing chamber can be made. Two or more plugs may be stacked up to magnetically connect to the same one receptacle to save a lot of space by magnetically connecting a lower connecting section of an upper plug to an upper receiving section of a lower plug.