Spatial distribution of energetic electrons at 25 keV deduced from X-ray observations (black crosses) and computed with the diffusive transport model of Kontar et al. (2014) with n = 9.5 × 10¹⁰ cm^-3, d = 5.5 Mm and λ = 1.4 × 10⁸ cm (red lines). The looptop source is shifted of 3.2 Mm in regards to the top of the loop, as described in Kuznetsov & Kontar (2015). For the model, the dashed or dotted lines indicate a confidence interval around the computed value shown by the plain line. A detailed description is provided in Sect. 4.1.