Cumulative depth distributions of Sockeye and Chinook salmon along the western edge of the ESSN boundary; n: sample size. Distributions show the proportion of time Sockeye salmon spent shallower than a given depth and the proportion of time Chinook salmon spent deeper than a given depth. Columns show the data divided by diel period and rows show the data divided by stage of tide (see Migration depths under Methods for definitions). The lower right panel shows the cumulative frequency distributions using all data. Vertical lines show median depths.