Intensity along the loop oscillation path extracted from time-distance images by taking the intensity at each point along the displacement time curves for eight values of s along the loop. (a) Indicates that the intensity is extracted from the second strand which was observed in six of the time-distance images, the results of which are represented as triangles in Fig. 5. The vertical dotted line represents the position in time of the linear fit to the intensity shown in Fig. 8.