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The x-axis records the time periods

The y-axis shows the percentages (from 0-100%) who are still alive.

The most striking difference is in the plotted curves.

These curves are cumulative:

Starting with 0 in the lower left corner, moving across to the upper right corner, which approaches 100%;

While survival begins at 100% in the upper left corner, and moves across to the lower right corner as members of the group die.