Brightening slope of strands as a function of heliocentric distance. A range of distance boundaries, shown as vertical dotted lines labeled by distance, separate strands into interior and exterior to the boundary. Two horizontal lines extending from each boundary to the left and to the right connect to boxes that correspond to interior and exterior strands, respectively. The x coordinate of each box is the median of the midpoint in log r of the strands. The y extent of each box contains the IQR of the k_r distribution. Inside each box, a horizontal line marks the median and a star symbol indicates the mean of the k_r distribution.