[
    [
        "XTENSION",
        "extension type",
        "C08",
        NaN,
        "c"
    ],
    [
        "BITPIX",
        "bits per data value",
        "I2",
        "always 16 for raw data",
        "c"
    ],
    [
        "NAXIS",
        "number of data axes",
        "I2",
        "always 2",
        "c"
    ],
    [
        "NAXIS1",
        "length of first data axis",
        "I4",
        NaN,
        "c"
    ],
    [
        "NAXIS2",
        "length of second data axis",
        "I4",
        NaN,
        "c"
    ],
    [
        "EXTNAME",
        NaN,
        "C08",
        NaN,
        "c"
    ],
    [
        "EXTVER",
        NaN,
        "I2",
        "always 1",
        "c"
    ],
    [
        "BSCALE",
        NaN,
        "R8",
        "always 32768.0",
        "c"
    ],
    [
        "BZERO",
        NaN,
        "R8",
        "always 1.0",
        "c"
    ],
    [
        "BUNIT",
        "physical unit of array values",
        "C08",
        "always \u2018ADU\u2019",
        "c"
    ],
    [
        "FILTER",
        "filter band",
        "C08",
        NaN,
        "b"
    ],
    [
        "DETSN",
        "detector serial number",
        "C40",
        NaN,
        "c"
    ],
    [
        "DETNAME",
        "detector name",
        "C40",
        "\u63a2\u6d4b\u5668\u578b\u53f7",
        "c"
    ],
    [
        "CHIPLAB",
        "chip label",
        "C08",
        "EMCCD/NIR",
        "c"
    ],
    [
        "CHIPTEMP",
        "chip temperature (in K)",
        "R4",
        NaN,
        "d"
    ],
    [
        "DEWTEMP",
        "dewer temperature (in K)",
        "R4",
        NaN,
        "d"
    ],
    [
        "DETSIZE",
        "detector size",
        "C20",
        "1080*1050(EMCCD)/640*512(NIR)\u56fe\u50cf\u603b\u5927\u5c0f",
        "c"
    ],
    [
        "IMGINDEX",
        "index of image",
        "I4",
        "\u56fe\u50cf\u5e27\u5e8f\u53f7",
        "b"
    ],
    [
        "IMG_EXPT",
        "image frame exposure start time",
        "C20",
        "\u672c\u56fe\u50cf\u5e27\u66dd\u5149\u5f00\u59cb\u65f6\u523b\uff08\u5149\u7ea4\u6570\u636e\u5305\u5305\u5934\u4e2d\u7684\u66dd\u5149\u65f6\u523b\uff09yyyy-mm-ddThh:mm:ss\u683c\u5f0f",
        NaN
    ],
    [
        "IMG_CABT",
        NaN,
        "C20",
        "\u8ddd\u79bb\u66dd\u5149\u5f00\u59cb\u65f6\u523b\u6700\u8fd1\u7684\u4e00\u6b21\u5e7f\u64ad\u65f6\u523b",
        NaN
    ],
    [
        "IMG_DUR",
        "image frame exposure duration",
        "R8",
        "\u672c\u56fe\u50cf\u5e27\u66dd\u5149\u65f6\u95f4",
        NaN
    ],
    [
        "IMG_PA",
        "position angle at IMG_CABT",
        "R8",
        "IMG_CABT\u65f6\u523b\u7684\u65b9\u4f4d\u89d2",
        NaN
    ],
    [
        "IMG_RA",
        "RA of pointing (degree) at IMG_CABT",
        "R8",
        "IMG_CABT\u65f6\u523b\u7684\u671b\u8fdc\u955c\u6307\u5411RA\u5206\u91cf\uff0c\u7531\u5bfc\u661f\u4eea\u63d0\u4f9b",
        NaN
    ],
    [
        "IMG_DEC",
        "DEC of pointing (degree) at IMG_CABT",
        "R8",
        "IMG_CABT\u65f6\u523b\u7684\u671b\u8fdc\u955c\u6307\u5411DEC\u5206\u91cf\uff0c\u7531\u5bfc\u661f\u4eea\u63d0\u4f9b",
        NaN
    ],
    [
        "DATASECT",
        "data section",
        "C20",
        "1024*1024(EMCCD)/640*512(NIR)\u6709\u6548\u56fe\u50cf\u5927\u5c0f",
        "c"
    ],
    [
        "PIXSCAL",
        "pixel scale",
        "R4",
        NaN,
        "c"
    ],
    [
        "PIXSIZE",
        "pixel size",
        "R4",
        NaN,
        "c"
    ],
    [
        "NCHAN",
        "number of readout channels",
        "I2",
        44928,
        "c"
    ],
    [
        "PSCAN1",
        "horizontal prescan width",
        "I4",
        "8(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "PSCAN2",
        "vertical prescan height",
        "I4",
        "always 0",
        "c"
    ],
    [
        "OSCAN1",
        "horizontal overscan width",
        "I4",
        "16(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "OSCAN2",
        "vertical overscan width",
        "I4",
        "18(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "UDARK",
        "height of upside dark reference region",
        "I4",
        "6(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "BDARK",
        "height of downside dark reference region",
        "I4",
        "2(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "LDARK",
        "width of leftside dark reference region",
        "I4",
        "16(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "RDARK",
        "width of rightside dark reference region",
        "I4",
        "16(EMCCD)/0(NIR)",
        "c"
    ],
    [
        "WCSAXES",
        "number of World Coordinate System axes",
        "I2",
        "always 2",
        "c"
    ],
    [
        "CRPIX1",
        "x-coordinate of reference pixel",
        "R8",
        "\u5c0f\u6570\u70b9\u540e1\u4f4d\u6709\u6548\u6570\u5b57",
        "c (\u4e0d\u9700\u8981\u5730\u9762\u4e34\u65f6\u89e3\u7b97\uff0c\u4f46\u9700\u8981\u5728\u5730\u9762\u6d4b\u8bd5\u9636\u6bb5\u63d0\u524d\u8bbe\u5b9a)"
    ],
    [
        "CRPIX2",
        "y-coordinate of reference pixel",
        "R8",
        "\u5c0f\u6570\u70b9\u540e1\u4f4d\u6709\u6548\u6570\u5b57",
        "c (\u540c\u4e0a)"
    ],
    [
        "CRVAL1",
        "first axis value at reference pixel",
        "R8",
        NaN,
        "c (\u540c\u4e0a)"
    ],
    [
        "CRVAL2",
        "second axis value at reference pixel",
        "R8",
        NaN,
        "c (\u540c\u4e0a)"
    ],
    [
        "CTYPE1",
        "the coordinate type for the first axis",
        "C08",
        "always \u2018RA---TAN\u2019",
        "c (TAN\u8fd8\u662f TPV\u9700\u8981\u4f4d\u7f6e\u5b9a\u6807\u786e\u5b9a)"
    ],
    [
        "CTYPE2",
        "the coordinate type for the second axis",
        "C08",
        "always \u2018DEC--TAN\u2019",
        "c (\u540c\u4e0a)"
    ],
    [
        "CD1_1",
        "partial of first axis coordinate w.r.t. x",
        "R8",
        NaN,
        "c (\u540c\u4e0a)"
    ],
    [
        "CD1_2",
        "partial of first axis coordinate w.r.t. y",
        "R8",
        NaN,
        "c (\u540c\u4e0a)"
    ],
    [
        "CD2_1",
        "partial of second axis coordinate w.r.t. x",
        "R8",
        NaN,
        "c (\u540c\u4e0a)"
    ],
    [
        "CD2_2",
        "partial of second axis coordinate w.r.t. y",
        "R8",
        NaN,
        "c (\u540c\u4e0a)"
    ],
    [
        "others",
        NaN,
        NaN,
        "other specific parameters",
        NaN
    ],
    [
        "EMGAIN",
        "EMgain for EMCCD",
        "R4",
        NaN,
        "c"
    ],
    [
        "GAIN",
        "gain (electron/ADU)",
        "R4",
        NaN,
        "c"
    ],
    [
        "DET_BIAS",
        "bias voltage",
        "R4",
        NaN,
        "c"
    ],
    [
        "RON",
        "readout noise",
        "R4",
        NaN,
        "c"
    ],
    [
        "READTIME",
        "readout time",
        "R4",
        NaN,
        "c"
    ],
    [
        "ROSPEED",
        "readout speed (in MHz)",
        "R4",
        NaN,
        "c"
    ],
    [
        "LS_STAT",
        "lazer status",
        "C04",
        "on/off",
        "d"
    ],
    [
        "IWA",
        "inner working angle of CPIC",
        "R4",
        NaN,
        "c"
    ],
    [
        "WFSINFO1",
        "x-direction residuals of WFS of CPIC",
        "R4",
        NaN,
        "d"
    ],
    [
        "WFSINFO2",
        "y-direction residuals of WFS of CPIC",
        "R4",
        NaN,
        "d"
    ],
    [
        "CHECKSUM",
        "HDU checksum updated yyyy-mm-ddTHH:MM:SS",
        NaN,
        NaN,
        NaN
    ],
    [
        "DATASUM",
        " data unit checksum updated yyyy-mm-ddTHH:MM:SS",
        NaN,
        NaN,
        NaN
    ]
]