Although validated extensively only for the soft band, the recipe is nominally applied also to the hard band. A detection that satisfies either C1 or C2 in a band is flagged extended in that band (and by definition not spurious). The source extent, <span style="font-variant:small-caps;">ext</span>, the so-called detection likelihoods[^3], <span style="font-variant:small-caps;">ext\_det\_stat</span> (fit *as extended*) and <span style="font-variant:small-caps;">ext\_pnt\_stat</span> (fit *as pointlike*), and the likelihood of being extended, <span style="font-variant:small-caps;">ext\_stat</span>, are <span style="font-variant:small-caps;">Xamin</span> parameters for which we follow the notation used in . The correspondence to database column names is reported in Table \[TabBand\].

-   The application of the P1 recipe, [which aims to define a sample of point sources with a high degree of purity and which is complete down to the lowest count rate possible ]{} , used for the first time in the `3XLSS` catalogue, characterised by\
       <span style="font-variant:small-caps;">pnt\_det\_stat $>$ 30 and (ext $<$ 3or ext\_stat=0)</span>.

    Stricly speaking, the sources which are not C1, C2, or P1 are to be considered undefined (i.e. there are not enough photons to unambiguously characterise them). The undefined sources are flagged as pointlike in the database. Those with <span style="font-variant:small-caps;">pnt\_det\_stat $<$ 15</span> are considered spurious in the band (i.e. not considered for inclusion 