\begin{theindex} \item $N_{\rm bits}$, 19, 21, 32, 74 \item {\tt TABLE}, extension, 35 \indexspace \item AIPS, 88 \item AIPS, Going, 6 \item angle, 18, 26, 75 \item angular measure, 18 \item ANSI, 7 \item ANSI, ASCII, 6 \item ANSI, FORTRAN-77, 6 \item ANSI, IEEE, 6, 30, 48 \item ANSI, tapes, 65 \item ANSI, X3.4--1977, 6 \item ANSI, X3.9--1978, 6 \item array, 7, 24 \item array descriptor, 48, 53 \item array size, 19, 20, 31, 34 \item array value, 7, 9, 24, 25, 71, 76 \item array, multidimensional, 12 \item array, substring, 2, 61 \item array, variable length, 50, 53 \item ASCII blank, 7 \item ASCII character, 3, 7, 29, 35, 38, 81 \item ASCII table, vii, 1, 2, 5, 35, 76, 87 \item ASCII text, vii, 3, 7, 11, 12, 16, 24, 38, 47, 71, 81 \item ASCII, ANSI, 6 \item AUTHOR, 24 \indexspace \item Basic FITS, vii, 1, 7, 71 \item binary table, vii, 1, 2, 5, 9, 10, 31, 41, 61, 79 \item BINTABLE, 41, 88 \item BINTABLE extension, 41, 61, 79, 87 \item BITPIX, 19, 21, 25, 26, 30, 32, 35, 40, 42 \item BLANK, 25, 30, 75 \item block size, vii, 1, 2 \item BLOCKED, 22, 27, 75 \item blocking, 5, 71, 72 \item BSCALE, 24, 25, 30, 76 \item BUNIT, 25, 75, 77 \item byte order, 29 \item BZERO, 25, 30, 76 \indexspace \item card image, 7, 12, 15 \item case sensitivity, 15, 16 \item CDELTn, 25, 75 \item character string, 16, 46, 47 \item COMMENT, 24 \item complex data representation, 18, 48, 73 \item COMPRESS, 88 \item conforming extension, 8, 10, 11, 13, 21, 71, 72, 74 \item coordinate axis, 10, 25 \item coordinate system, 23, 25 \item coordinate value, 25 \item CROTAn, 25, 75 \item CRPIXn, 25, 75 \item CRVALn, 25, 75 \item CTYPEn, 25, 75 \indexspace \item DATAMAX, 26, 75 \item DATAMIN, 26, 75 \item DATE, four-digit year form, 21 \item DATE, two-digit year form, 22 \item DATE-OBS, 22, 75 \item DATExxxx, 23 \item deprecate, 2, 8, 22, 23, 31, 55, 71, 75, 76 \item DUMP, 88 \indexspace \item END, 20, 33, 36, 41, 43, 52 \item EPOCH, 23, 75 \item EQUINOX, 23, 75 \item EXTEND, 21, 22, 27, 35, 40, 41 \item extension, vii, 1, 2, 8, 10, 11, 13, 26, 27, 29, 66, 74, 87 \item extension name, 3, 8, 10, 13, 26 \item extension registration, 13, 72 \item extension type name, 21 \item extension, conforming, 8, 10, 11, 13, 21, 71, 72, 74 \item extension, standard, 10, 13, 21, 35, 40, 41, 72 \item EXTLEVEL, 26 \item EXTNAME, 8, 26 \item EXTVER, 26 \indexspace \item field, empty, 43, 47 \item FILEMARK, 88 \item fill, 12, 15, 34, 37, 38, 46, 72 \item FITS structure, 2, 7--9, 11, 13, 21, 55, 71 \item FITS Support Office, 13, 21, 72, 74 \item FITS Working Group, vii, 1 \item floating point, 17, 48, 83 \item floating point FITS agreement, vii, 5, 71 \item floating point, 64 bit, 73 \item floating point, complex, 18, 48, 74 \item format, 36 \item format, data, vii, 29 \item format, extension, 8 \item format, fixed, 16, 73 \item format, free, 16 \item format, keywords, 16 \item format, standard, 1 \item FORTRAN-77, 36 \item FORTRAN-77, ANSI manual, 6 \item FORTRAN-77, format, 38 \item FORTRAN-77, list-directed input, 73 \item FORTRAN-77, list-directed read, 73, 74 \item fraction, 8, 71 \indexspace \item GCOUNT, 21, 32--34, 36, 41, 42 \item Going AIPS, 6 \item group parameter value, 8, 33, 34 \item GROUPS, 33 \indexspace \item HDU, 8, 19 \item HDU, extension, 8, 11 \item HDU, primary, 8--13 \item heap, 45, 51, 53, 77 \item HISTORY, 24 \item hyphen, 15 \indexspace \item IAU, vii, 1--3, 5, 9, 71 \item IAU Style Manual, 5, 18, 74 \item IAU, 1988 General Assembly, vii \item IAUFWG, vii, 9, 13, 21 \item IEEE, 9 \item IEEE floating point, 3, 30 \item IEEE NaN, 9 \item IEEE special values, 9, 26, 30, 76, 83 \item IEEE, ANSI, 6 \item IMAGE, 40 \item image extension, vii, 1, 2, 5, 40, 41, 79 \item INSTRUME, 23 \item integer, 16-bit, 29, 47 \item integer, 32-bit, 29, 47, 48 \item integer, 64-bit, 30, 48 \item integer, 8-bit, 29, 47 \item integer, complex, 18, 73 \item interferometry, 31 \item IUE, 6, 9 \item IUEIMAGE, 88 \indexspace \item keyword, commentary, 15, 24 \item keyword, indexed, 9, 15, 19, 71 \item keyword, mandatory, 35, 73 \item keyword, new, 26 \item keyword, order, 19, 20, 31, 35 \item keyword, required, 1, 2, 9, 18, 20, 21, 31, 40, 41, 74, 76 \item keyword, reserved, 1, 2, 10, 21, 33, 37, 44, 72, 74, 76 \item keyword, restrictions, 27 \item keyword, valid characters, 15 \indexspace \item list-directed input, 73 \item list-directed read, 73 \item logical value, 17 \indexspace \item mantissa, 8, 9, 71 \indexspace \item NaN, IEEE, 48 \item NAXIS, 11, 12, 19, 21, 22, 32, 34, 35, 41, 42, 74, 75 \item NAXIS1, 32, 35, 38, 42, 43, 45, 46, 52, 76 \item NAXIS2, 35, 38, 42, 45, 46, 52, 76 \item NAXISn, 11, 12, 19, 21, 25, 32--34, 41, 74 \item NOST, 9 \item NRAO, 88 \item NULL, ASCII, 7, 47 \indexspace \item OBJECT, 23 \item OBSERVER, 23 \item offset, 52 \item order, array index, 12 \item order, byte, 29 \item order, extensions, 13 \item order, keyword, 15, 19, 20, 31, 35 \item order, {\em FITS\/} structures, 11 \item ORIGIN, 22 \indexspace \item parameter, vii, 33, 34 \item PCOUNT, 21, 32--34, 36, 41, 42, 52 \item physical value, 7, 9, 24--26, 33, 34, 37, 44, 71, 75 \item primary data array, 7, 9, 11, 12, 20, 24, 32, 34, 41, 72 \item primary header, 2, 7, 10, 11, 18, 21, 27, 31, 66, 75 \item PSCALn, 33, 34, 76 \item PTYPEn, 33, 34 \item PZEROn, 34, 76 \indexspace \item random groups, vii, 1, 2, 5, 8, 24, 31, 76 \item random groups array, vii, 34 \item REFERENC, 24 \item reference point, 10, 25, 72 \item registration, extension, 13 \item repeat count, 10, 43, 47 \indexspace \item scaling, data, 25, 34, 37, 44, 75 \item sign bit, 29 \item sign character, 38 \item significand, 9 \item SIMPLE, 32 \item SIMPLE, before random groups, 31 \item SIMPLE, in primary header, 18, 19 \item SIMPLE, in special records, 13 \item slash, 16 \item special records, 8, 10, 11, 13 \item special values, IEEE, 48 \item standard extension, 10, 13, 21, 35, 40, 41, 72 \item substring arrays, 61 \indexspace \item TABLE, 35 \item TABLE extension, 76, 79, 88 \item tape, 9-track half-inch, vii \item TBCOLn, 36 \item TDIMn, 46, 63, 77 \item TDISPn, 45, 77 \item TELESCOP, 23 \item TFIELDS, 36, 42, 76 \item TFORMn, 36, 43, 47, 48, 51, 61, 76 \item THEAP, 45, 52, 77 \item time system, 22 \item TNULLn, 37, 38, 44, 47, 48 \item TSCALn, 37, 38, 44, 52, 77 \item TTYPEn, 37, 44 \item TUNITn, 38, 44, 77 \item twos-complement, 29, 30 \item TZEROn, 37, 38, 44, 52, 77 \indexspace \item underscore, 15, 38 \item units, 9, 10, 18, 25, 38, 41, 44, 74, 75, 77 \item Universal Time, 22, 75 \indexspace \item value, 21, 22 \item value, undefined, 37, 38, 44 \item variable length array, 50, 53 \indexspace \item XTENSION, 10, 13, 21, 26, 35, 40, 41, 74 \end{theindex}