IPI values of heart beats

InterPuls Interval (IPI) is the time difference between two R-R peak of the heartbeat based on mili-second. Current dataset belongs to  4223 subjects and the IPI values are extracted from ECG datasets provided by PhysioNet. The main file IPI-All.txt contains the value of IPIs and each line represents a subject. In the rest of the files nbit.txt.7z, n is the number of bits in converting the IPI values to binary. For instance, if n=2, then after converting the IPI value to binary, only the least two significant bits were inserted in the 2bit.txt.7z.