Spectral energy distribution of the compact nebula. The diamond shows the flux obtained with CFHT/AOB-KIR. Spitzer measurements obtained in the IRAC 3.6, 4.5, 5.6, 8.0 μm bands and the MIPS 24 μm band are presented with triangles. All the infrared fluxes are corrected for interstellar extinction. Light grey bow tie region shows the uncertainty of the power-law fit to the infrared fluxes. The fitted IR photon index is Γ_IR = 1.7 ± 0.3. The black bow tie represents the intrinsic X-ray spectrum (with its uncertainty) of the compact nebula as obtained from Chandra observations (Camilo et al. 2006). It is described by the photon index Γ = 1.5 ± 0.1 (see text).