A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. The primary system provides PET data processing and reconstruction for the secondary array, in addition to the first array. Cache state information is provided to a home cluster cache coherence controller to allow silent evictions of shared memory lines and change to dirty associated intervening requests to be efficiently handled. 2\u02dc20 wt % of a light diffusing bead with an average particle diameter of 0.