IR (WISE) data for the EXO50 sources discussed here. Columns are as follows: (1) number used to mark the object in the plots shown in Section 5; (2) source name; (3) X-ray-to-optical flux ratio; (4) optical spectroscopic classification and redshift; (5) W1 magnitude (3.4 μm) and 1σ error; (6) W2 magnitude (4.6 μm) and 1σ error; (7) W3 magnitude (12 μm) and 1σ error. The magnitude lower limits correspond to the 95 per cent confidence level as reported in the WISE catalogue; (8) W4 magnitude (22 μm) and 1σ error. The magnitude lower limits correspond to the 95 per cent confidence level as reported in the WISE catalogue; (9) Log of the rest frame 12.3 μm luminosities (⁠|$\nu _{12.3 \,\mu \mathrm{m}} \times L_{12.3 \,\mu \mathrm{m}}$| in erg s⁻¹) computed as described in Section 3.3.