Header files have names of the form `header.record' on
writable UNIX and Macintosh file systems, 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.) On CD-ROM and MS-DOS file systems, because of restrictions on
the length of extensions, header files have names of the form
`record.HEA'. 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 dbinit read the names of
the signal files and their attributes as given in the array of
DB_Siginfo objects; sampfreq also reads a `header'
file to determine the sampling frequency used for a record.
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