Sensitivity map of the Thomson scattering emission for the Solar Orbiter–Sun geometries at perihelion. Each number signifies the location in the orbit identified by the + (“2” is perihelion of 0.28 AU, while “1” and “3” are both at 0.34 AU). The three differently coloured arcs mark the loci of three percentages of the total brightness integration along the LOS. The solid line closest to the location gives the loci at 5% of the total integral, the dotted line gives 50% and the solid line farthest from the location gives 95%. The extents of the arcs mark the SoloHI FOV. The black dotted lines show the direction of the Parker Spiral for a 300 km s⁻¹ wind.