A centrifugal compressor is disclosed. The conductive layer includes a first high surface energy area, a second high surface energy area smaller in width than the first high surface energy area, and a third high surface energy area smaller in width than the second high surface energy area. At least one surface of surfaces of the three lenses is formed to be aspherical. Age information associated with one or more related members in the set of related members is examined. The agent data determining the behavior of the electronic pet are updated responsive to the mouse actuation by the user, such as caressing the pet or serving refreshments to the pet, for varying the behavior of the pet, represented by animation, depending on the maintenance environment. The conductive tracing may be substantially symmetric about an axis that passes through the center portion of the conductive tracing.