SUMSS Catalogue Format

Columns (1) & (2): The right ascension ($\alpha$) and declination ($\delta$) of the source in J2000 coordinates.

Column (3): The uncertainty in Right Ascension in seconds of arc, calculated from the quadratic sum of the MOST Right Ascension calibration uncertainty $\left(1.5''\right)$ and equation 2 of the catalogue paper.

Column (4): The uncertainty in Declination in seconds of arc, calculated from the quadratic sum of the MOST Declination calibration uncertainty $\left(1.7''\right)$ and equation 3 of the catalogue paper.

Column (5): The peak brightness in units of mJy beam^-1 and its associated uncertainty calculated from the quadratic sum of equation 8 of the catalogue paper and the MOST flux density calibration uncertainty of 3 per cent.

Column (6): The total flux density in units of mJy and its associated uncertainty, calculated from the equations described in C97.

Columns (7) & (8): The fitted major & minor axes of the source in arcseconds.

Column (9): The fitted major axis position angle of the source in degrees east of north. Most unresolved sources would have PA values close to 0$^{\circ}$ or 180$^{\circ}$ since the MOST elliptical beam has PA=0.

Column (10): If the fitted major axis size exceeds the beam size by more than $2.33\sigma(\theta_{\rm {M}})$, the major axis size after deconvolution from the MOST beam is given in arcseconds.

Column (11): If the major axis is resolved the minor axis is subsequently checked using the same criterion. If the minor axis is found to be resolved the deconvolved minor axis size is given in arcseconds.

Column (12): If the major axis is resolved, its deconvolved position angle in degrees east from north is given.

Column (13): The name of the mosaic in which the source appears. The original mosaics are available online at http://www.astrop.physics.usyd.edu.au/mosaics. In the case of duplicate matches the mosaic name quoted is that used for the fit which is chosen to be included in the catalogue.

Column (14): The number of mosaics in which the source appears. This is included to let the user know when the source appears in more than one image. The source parameters which appear in the catalogue are those for the most reliable fit.

Columns (15) & (16): The X & Y pixel positions of the source on the quoted mosaic.

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