The other files in this directory (Normal, CHF, Sleep, Wake, Yng, Old) contain lists of PhysioBank record and annotator names corresponding to the current on-line copies of the data used in: Mietus JE, Peng C-K, Henry I, Goldsmith RL, Goldberger AL. The pNNx files: re-examining a widely used heart rate variability measure. Heart 88:378-380; 2002. Each line in these lists contains information about one of the 155 data sets in one of these forms: -r RECORD -a ANNOTATOR -r RECORD -a ANNOTATOR -f START -t END The data sets themselves can be found in the PhysioBank archives: http://www.physionet.org/physiobank/database/nsrdb/ http://www.physionet.org/physiobank/database/nsr2db/ http://www.physionet.org/physiobank/database/chfdb/ http://www.physionet.org/physiobank/database/chf2db/ http://www.physionet.org/physiobank/database/fantasia/