Extended Data Fig. 4. MCMC constrained maps of the thermal and suprathermal electron parameters.

a, Thermal electron number density n_th. For each pixel, the median value of the MCMC probability distribution is shown. b, Similar to a but for the non-thermal electron number density n_nth. c, Map of the ratio of the upper limit of the thermal number density $n_{\mathrm{th}}^{\mathrm{upper}}$ (defined as one σ above the median $n_{\mathrm{th}}+{\sigma }_{n_{\mathrm{th}}}$) to the non-thermal number density n_nth. d, Similar to a but for the low-energy cut-off E_min.