Not in the catalogue - enter it from the section tables. 0 ignores the root fillets (conservative: smaller plastic modulus).
ArcelorMittal Orange Book (UKB / UKC to BS 4-1, IPE / HE to Euronorm 19-57 / 53-62, angles to BS EN 10056-1).
The bottom of the plate mirrors the top (moment reversal); the bolts below the compression flange carry the vertical shear.
For butt-welded flanges the leg is used only in the compression dispersion (2s); 0 = none.