Table 12.8:
SILO - Basic FITS Keywords
Keyword and value |
Description |
SIMPLE = T |
Standard FITS Format |
BITPIX = 16 |
16-bits 2's complement pixels |
NAXIS = 2 |
Two-dimensional image |
NAXIS1 = 640 |
Dimension along x-axis |
NAXIS2 = 80 |
Dimension along y-axis |
EXTEND = T |
Extensions are present |
CRPIX1 = 1. |
x reference pixel |
CRPIX2 = 1. |
y reference pixel |
CRVAL1 = nnnn.nn |
Wavelength at reference pixel |
CRVAL2 = 1. |
Coordinate of CRPIX2 |
CDELT1 = nn.nnnn |
Increment in wavelengths |
CDELT2 = 1. |
Increment unit along y-axis |
CTYPE1 = 'WAVELENGTH' |
Units along x-axis |
CTYPE2 = 'SCAN ' |
Units along y-axis |
BUNIT = 'FN ' |
Flux Numbers |
BSCALE = 3.1250E-02 |
real=tape*bscale+bzero |
BZERO = 0. |
Pixel offset |
TELESCOP= 'IUE ' |
International Ultraviolet
Explorer |
FILENAME= 'AAAnnnnn.SILO' |
Filename(camera)(number).SILO |
DATE = 'dd/mm/yy' |
Date file was written |
ORIGIN = 'VILSPA ' |
Institution generating the file |
DATAMIN = nnnnn.n |
Minimum pixel value |
DATAMAX = nnnnn.n |
Maximum pixel value |
XTENSION= 'IMAGE ' |
Image extension |
BITPIX = 16 |
16-bit 2's complement pixels |
NAXIS = 2 |
Two_dimensional image |
NAXIS1 = 640 |
Dimension along the x-axis |
NAXIS2 = 80 |
Dimension along the y-axis |
PCOUNT = 0 |
Number of bytes following data
matrix |
GCOUNT = 1 |
Number of groups |
CRPIX1 = 1. |
x reference pixel |
CRPIX2 = 1. |
y reference pixel |
CRVAL1 = nnnn.nn |
Coordinate of CRPIX1 |
CRVAL2 = 1. |
Coordinate of CRPIX2 |
CDELT1 = nn.nnnn |
Increment unit along the x-axis |
CDELT2 = 1. |
Increment unit along the y-axis |
CTYPE1 = 'WAVELENGTH' |
x-axis units |
CTYPE2 = 'SCAN ' |
y-axis units |
BUNIT = ' ' |
Unitless |
FILENAME= 'AAAnnnnn.SFLO' |
Filename (camera)(number).SF(disp) |
EXTNAME = 'SILOF ' |
SILO pixel quality flags |