Variation in the loop width along its length. Panel a shows the normalized HRI_EUV intensities calculated along different slits (highlighted via the color bar). The same but for the AIA 171 Å data is shown in panel b. The time at which these loop intensities were derived is identical to the time shown in Fig. 1. Each curve is adjusted to ensure that its peak lies at x = 0 Mm. The vertical and horizontal dotted lines in each panel act as references to approximate the FWHM. AIA curves from slits 5 and 6 are not displayed because the nearby moss-type structure contaminates the curves significantly.