2-σ differential flux upper limits (red lines) of WR 140 compared to theoretical modelling explained in Reimer et al. (2006). Black curves show IC spectra of WR 140 orbital phase angles Φ = 0.97 (bottom dash-dotted line), Φ = 0.93 (bottom dotted line), Φ = 0.2 (dashed line), Φ = 0.44 (solid line), Φ = 0.67 (top dotted line), and Φ = 0.8 (top dash-dotted line). The EGRET upper limit (blue dotted line) is taken from Reimer et al. (2006).