Fig. 2From: Relationship between Na layer and CNA variations observed at Syowa, Antarctica Median values in the fitted PDF of the Na densities from 85 to 105 km for CNA of 0–0.25 dB (blue) and CNA of 0.25–2 dB (red). b Deviation between the median values for CNA of 0–0.25 dB (quiet) and CNA of 0.25–2 dB (active) which are shown in a. The horizontal error vars correspond to \(\pm 1 \sigma\)Back to article page