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The table below summarizes the different FITS formats used for data sets
archived within MAST. The notation used for the "format" column is described
below. For more information on file formats, click on the
mission names.
| Mission | File Type | Sample Filename | Format* | Description / Comments |
|---|---|---|---|---|
| BEFS | Extrcted Spectral Files | befs2223.spc1 | 1-2Bf | 12 columns, fluxes given in both photons & ergs/cm2/... units |
| Photon-list Files | befs2223.lst1 | B | 6715226 rows! Not widely used. | |
| Copernicus | Raw | c084.pep | Bv | Binary table containing variable-length vectors, with each row containing data from one scan. |
| Coadded Scans | c084-001.bu1 | Bf | Binary table with fixed-length vectors. | |
| Spectral Atlas Files | alphacma2.fts | B | Binary table with scalar fields; each row contains data for one wavelength. | |
| EUVE | Image | hz_43__9303101242N_img.fits | 1-4I,1-5B | Images and filter limits for one EUVE observation. |
| Event | hz_43__9303101242N_evt.fits | 5-11B | Event and monitor data for one EUVE observation. | |
| FOS | Calibrated Wavelengths | y3lg0107t_c0f.fits | PA | 2064xn primary array of wavelength vectors (A) |
| Calibrated Fluxes | y3lg0107t_c1f.fits | PA | Primary array of fluxes (ergs/cm2/s/A) | |
| Calibrated Sigmas | y3lg0107t_c2f.fits | PA | Primary array of sigmas (ergs/cm2/s/A) | |
| GHRS | Calibrated Wavelengths | z0ex021vt.c0f | PA | 2000x1 primary array of wavelengths (A) |
| Calibrated Fluxes | z0ex021vt.c1f | PA | Primary array of fluxes (ergs/cm2/s/A) | |
| Calibrated Sigmas | z0ex021vt.c2f | PA | Primary array of Sigmas (ergs/cm2/s/A) | |
| HUT | Flux Calibrated | 0833p652_100_01_d_ph.fits | Pnh | non-homogeneous primary array of fluxes and sigmas |
| IUE | Raw file | swp12345.rilo | P | 8-bit 768x768 image. |
| Linearized image | lwp12345.lilo | P,I | 16-bit 768x768 array. | |
| Resampled low dispersion | swp12345.silo | P,I | 16-bit 640x80 primary array, and a 16-bit 640x80 image extension | |
| Resampled high dispersion | lwr97095.sihi | P,Bf,2I | 16-bit 768x768 primary array, and auxillary data. | |
| Merged extracted spectral files | lwp12345.mxlo | Bf | binary table with fixed-length vectors containing fluxes and wavelengths (in high dispersion, each row is one echelle order) | |
| NICMOS | mosaiced image | n43u050_mos.fits | P | |
| 2-d spectra | .fits | I | ||
| STIS | Preview Spectra | o4qa91929_p.fits | B | wavelengths in A, fluxes in ergs/cm2.. units. |
| 1-d spectra | o4mt02030_x1d.fits | Bf | 18 fields including wavelgenths & calibrated fluxes | |
| summed 1-d spectra | o4mt02030_sx1.fits | Bf | 18 fields including wavelgenths & calibrated fluxes | |
| TUES | Single order | tues6003_3_ord40.fits | B | format similiar to BEFS, fluxes in both photons & ergs/cm2.. units. |
| Multiple Order | tues6003_3_spectrum.fits | B | 20 row binary table, fluxes in both photons & ergs/cm2.. units. | |
| UIT | Raw density | fuv0123d.fit | P | 16-bit 2048x2048 (ASTRO-1) or 4096x4096 (ASTRO-2) image. |
| Linearized flat-fielded (e,f,fc) | fuv0123f.fit | P | 16-bit 2048x2048 (e,f) or 512x512 (fc) image. | |
| Undistorted, rotated (g,gc) | fuv0123g.fit | P | 16-bit 2048x2048 (g) or 512x512 (gc) image. | |
| Point-source (pph)/Aperture (aph) Photometry | fuv0123aph.fit | A | ASCII Table of photometric measurements. | |
| WUPPE | Halfwave Level 1 Data | ss-cyg_322731_1_hw.fits | P,0-1B | fluxes stored in primary array, polarimtery data in binary table |
*Format Notation:
The following abbreviations are used for the various types
of FITS header and data units (HDUs):
If a number precedes the letter, it represents the number of occurrences of that particular HDU within the file. In some cases, the number of extensions may vary for a given file type. As an example, "P,Bf,2-4I" would describe a FITS file containing a primary HDU, followed by a binary table extension using fixed-length vector fields, followed by two to four image extensions.
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