... list

Tables 5, 6, 7 are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/373/63

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... Paradijs

Jan van Paradijs passed away on November 2nd, 1999.

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... accuracy

As a concequence of this data quality based decision variable sources are preferentially listed in their luminous state which may have different spectral characteristics compared with their less luminous state. Therefore sources detected as variable (see Tables 2 and 3) are marked with a "$\sim$''-sign in front of their RXJ-number.

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...1996)

Kahabka (1999) used not only $HR_{\rm 1}$ but also $HR_{\rm 2}$ and $L_{\rm X}$ (with reference to the local $N_{\rm H}$-value at the source position) and their respective ratios to discriminate supersoft sources. Using these criteria and the source list of S97, he came up with an additional 26 new supersoft source candidates, 4 of them correlated with foreground stars in S97 and 4 with supernova remnants. Excluding these 8 sources, 18 additional supersoft source candidates in M 31 remain.

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