Change/evaluation TYPe, AUThor's name (the person who makes or responsible for the change, not necessarily the evaluator of the data set), the DATe of change, literature CUToff date (optional when changes do not involve evaluation, CITation (optional, if not published), COMments (optional)
Note that history records indicate various revisions. These are wiped out at the next FULL evaluation.
For FULL evaluation NNDC will introduce "H" records based on the COMMENTS data set.
156DY H TYP=MOD$AUT=C. Reich$DAT=15-MAY-1996$CUT=01-MAY-1996$ 156DY2H COM=Updated SDB data beyond B. Singh's evaluation of SD Bands 156DY H TYP=MOD$AUT=B. Singh$DAT=31-DEC-1995$CUT=15-DEC-1995$ 156DY2H COM=Updated SDB data only$ 156DY H TYP=UPD$AUT=R. Helmer$DAT=31-DEC-1994$CUT=15-DEC-1994$ 156DY2H COM=updated data set for new references since last full evaluation 156DY H TYP=FMT$AUT=J. Tuli$DAT=1-DEC-1994$COM=FIXED Format$ 156DY H TYP=FUL$AUT=R. Helmer$DAT=20-AUG-1991$CUT=01-May-1991$ 156DY2H CIT=NDS 65, 65 (1992)