Left: density (x-axis) and temperature (y-axis) values at the 3D emissivity plot crossing points for the AR loop, obtained assuming non-Maxwellian distributions with different values of κ, except for κ = 2. The density and temperature values for the Maxwellian case in Sect. 4.2 are also shown for comparison. Right: 3D emissivity ratio for the κ = 2 case. We note that there is no crossing point in this case. Different colours for the surfaces indicate different ions as described in the legend.