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Header files have names of the form `record.hea', where
record is the record name. (MIT DB records are named 100--124 and
200--234 with some numbers missing. AHA DB records are named
1001--1010, 2001--2010, 3001--3010, 4001--4010, 5001--5010, 6001--6010,
7001--7010, and 8001--8010. ESC DB records are named e0103--e1304, with
many numbers missing.) Header files are text files, with lines
terminated by ASCII carriage-return/line-feed pairs, created by
newheader, setheader, or setmsheader, from which
isigopen, osigopen, and wfdbinit read the names of
the signal files and their attributes as given in the array of
WFDB_Siginfo objects; sampfreq also reads a header
file to determine the sampling frequency used for a record.