These data are from the file rr1.txt
in the `RR interval time series modeling:
A challenge from PhysioNet and Computers in Cardiology 2002' site of PhysioNet.
sponsored by NIH's National Center for Research Resources.
The data are the RR intervals (beat-to-beat intervals measured
between successive peaks of the QRS complex) for patients in normal sinus rhythm
(record 16265 of the MIT-BIH database).