Follow UsReturn to the VO article in the June 2006 archive Newsletter
Steps Followed to Create VO Compatible Spectral Container Files
As a result of these problems and following the FITS serializations recommended in the VO Spectral Data Model paper, files were created using a FITS binary table format containing fixed length vector fields with a core set of standard keywords defined in the binary table extension header (the original mission-defined primary header keywords were preserved). This format has been used to generate new files for the following missions (special modifications, if any, are described):
| Instrument | Modifications |
|---|---|
| GHRS | Wavelengths, fluxes and sigmas from 1-d files originally stored in separate c0f, c1f & c2f files were merged into a single one row binary table file. 2-D files containing mulitple exposures were coadded after interpolating values to the first wavelength array and stored in the above format along with a vector describing the number of points coadded at each wavelength. |
| FOS | Wavelengths, fluxes and sigmas originally stored in separate c0, c1, & c2 files were merged into one binary table file |
| STIS | The formats basically remained the same as before with one spectral order per row in the binary table. |
| FUSE | Scalar values from the multi-row binary table merged spectrum file were converted to a single row binary table file containing vector fields |
| IUE | Low dispersion files stored as one row binary tables containing arrays of wavelength, flux and sigmas without padded zeroes or uncalibrated data points. High dispersion data are stored in multi-row files with one order per row with padded zeroes only at the ends of orders and only calibrated data. |
| HUT | Fluxes and sigmas were extracted from the primary array and a wavelength array was created from keyword values. |
| BEFS,WUPPE,TUES | Output wavelength, flux, and error vectors as described above |
| EUVE | The lw, mw, and sw spectra were merged into a one-row binary table file |
Return to the VO article in the June 2006 archive Newsletter
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