A high temperature line analysis for Fe xxiv (left hand image) and Fe xvi (right hand images). Fe xxvi velocity shifts derived from a single Gaussian fit are are shown in the left hand image while images from a double Gaussian fit of Fe xvi are shown on the right. From left to right: the intensity of the second Gaussian component, the velocity shift of the centre component and velocity shift of the second component found in the blue-wing – note the corresponding velocity ranges for each image. The positions marked are identical to those shown in Fig. 9 and Sect. 4.3.