A log is provided at {HEAD ~ each individual scanning entity} for storing locally constructed printhead defect models and printhead defect models that have been constructed at {TAIL ~ other scanning entities} in the network 
A log is provided at { HEAD ~ each individual scanning entity } for storing locally constructed printhead defect models and printhead defect models that have been constructed at { TAIL ~ other scanning entities } in the network
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH