In a PNNI routing computation system, each ATM exchange stores a plural types of weight values for computing route for each link and stores a type which a subscriber uses for routing. The container has an inlet to the second compartment in the outer wall thereof which is closeable by a plug or stopper. The gift card holder is movable between a first position relative to the cover when the greeting card is in a closed state, and a second position relative to the cover when the greeting card is in an opened state. The air-to-fuel ratio estimate is generated in dependence of a predetermined fuel deposit factor. In some embodiments, the radiating power is reduced to zero. Correction forces for each forcer are determined such that the net effect of the corrections is equal and opposite to the pitch torques previously determined.