How can I tell whether polarization data, as well as the UV spectrum, are available for a particular object? In the search results page, the polarization and position angle will both be set to 0.000 if no polarization data are available. In this case, only the ultraviolet spectrum is available from the archive. In addition, the FITS file for an observation including polarization data is significantly larger (typically 34560 bytes uncompressed) than one with only spectral data (11520 bytes).