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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.