Same as Fig. 1 for the Ca II K (top) and 8498 Å (bottom) lines. The pixel-by-pixel median of the line is shown as a thick blue line. The pixel-by-pixel rms is shown as the thick black line and shaded area. The zero velocities/wavelengths of the lines are marked as dashed vertical lines. The correlation coefficient (estimated as a Spearman rank correlation with value r and false alarm probability p) is shown on the right in the colour scheme, with the black contours marking the high significance (p> 10^-5) areas with r = 0.6,0.7,0.8,0.9.