> The way this graph has been constructed...
It's a log y-axis. A diagonal line downwards is exponential relaxation to 0.
It's a log y-axis. A diagonal line downwards is exponential relaxation to 0.
"Survivorship (on a log scale) is depicted by the shaded areas."
Notably, the journal article shades the area underneath the line that is labeled 'survival' in the linked article.