Relative occurrence of temperatures in the QS. Top left: temperature vs. optical depth for the full FOV. The relative occurrence of a given temperature is indicated by the colour with the corresponding colour bar at top. Thick black line: original HSRA model. Dashed line: average temperature. The vertical dashed lines denote the layers of log τ for which the temperature histograms are shown in the rest of the panels. In the histograms, black/blue/red lines denote the full FOV/magnetic/field-free locations.