The left plot shows mean mu in kilopascal versus depth from 0 to 20 metres. Data points increase with depth from about 22 to about 26 kilopascal, with a straight trend line. The right plot shows sigma in kilopascal versus depth. Values increase from about 6 to about 8.5 kilopascals with depth. Both plots display scattered measurements aligned with upward linear trends.
Variation and linear regression fitting of (a) mean values of X and (b) standard deviation values of X along each sub-domain