Distribution of strands into comets and over heliocentric distance. Pre-perihelion strand midpoints (vertical axis) are plotted as open circles for each comet (horizontal axis) in the original sample (644 strands for 141 comets). Horizontal dotted lines mark heliocentric bin boundaries. Numbers of strands and comets in each bin in the original sample are shown separated by a slash to the right of the Figure. A debiased strand sample (see text for details) is overplotted as red dots.