spacer link to MAST page spacer logo image spacer

Return 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