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BIGSTRNG= 'This is a long string value that is continued &' / Any comments
CONTINUE 'over three keywords in the& ' / may be appended
CONTINUE ' FITS header.' / after the quoted value.
The & character is used as the last non-blank character of the string
to indicate that the string is (probably) continued on the following
keyword (if the next keyword name = CONTINUE as described below).
Each continuation line has the keyword name = CONTINUE .
Since there is no equals sign in column 9, this keyword belongs to the
same class of keywords as the COMMENT and HISTORY
keywords that do not
have a defined value. Under our convention the continuation of the
character string value is enclosed in quotes starting in column 11 (or
higher) of the 80-character record. Any other characters (e.g. a
comment field) may optionally follow the closing quote character on any
or all of the keywords.
Finally, the following keywords should be added to the header of any
FITS extension that uses this long string convention (the exact
wording may change slightly):
LONGSTRN= 'OGIP 1.0' / The OGIP long string convention may be used.
COMMENT This FITS file may contain long string keyword values that are
COMMENT continued over multiple keywords. This convention uses the '&'
COMMENT character at the end of a string which is then continued
COMMENT on subsequent keywords whose name = 'CONTINUE'.
The presence of the LONGSTRN keyword serves to indicate that long
string keywords may be present in the FITS file. The value of this
keyword gives the name and version number of the specific convention
that is used, which in our case is the OGIP long string convention,
version 1.0. Note that the value of this keyword is a string so that
it may be used to give the name of any other convention that the FITS
community might eventually adopt.
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