Contributions from different target radiation fields to IC emission from a hypothetical source with properties similar to Vela X as observed by H.E.S.S. Top panel: SED from the three individual target radiation fields. Bottom panel: relative weight of each component with respect to the total. The three target radiation fields are: the cosmic microwave background (CMB), a far-infrared (FIR) field parametrised as a diluted blackbody with temperature of 30 K and energy density of 0.2 eV cm⁻³, and near-infrared (NIR) field parametrised as a diluted blackbody with temperature of 3000 K and energy density of 1 eV cm ⁻³. The parent electron population has a spectrum parametrised by Eq. (3). We adopt A = 3 × 10²⁹ eV⁻¹, and E₀ = 10 TeV. The reference spectra (solid lines in the top panel) correspond to α = 1.75, E_cut =70 TeV, and β = 1.2. The shaded bands show the range spanned by variations of the electron spectrum with 1.4 < α< 2.1, 40 TeV < E_cut < 100 TeV, and 0.9 < β < 1.5 (cf. Table 3). The assumed distance of the source is 290 pc.