Top panel: Comparison of correlation coefficients derived using the whole sample (abscissa) with those determined for the single component dominated sightlines (ordinate). There is a tendency for the correlation coefficients for the SCDs to be higher. The stars that we consider to be SCD from their K I profiles are HD numbers 36861, 36862, 88661, 89587, 93576, 137753, 144217, 145501, 145502, 147932, 148184, 156738, 164438, 164865, 167264, 169454, 188294 and 318014. Blue and orange symbols: Greater than or equal to ten or 15 data points, respectively. Bottom panel: Correlation coefficients comparing the 1318 nm sample excluding emission-line stars with the whole sample.