dfos = Data Flow Operations System, the common tool set for DFO . ... README file | ... AOG discovers the new pre-IMG data in NGAS, retrieves and pushes them to the QC machine into $DFO_RAW_DIR/PREIMAGING, launches processPreImg there; waits for EXECUTED file . ... processPreImg is executed, writes a file EXECUTED into $DFO_SCI_DIR/PREIMAGING (used as a flag to AOG) . ... the EXECUTED file is detected by the AOG process; all product data (fits files, logs, README, USERREPORT) are sent to AOG . ...