Qab composition graph

At the surface, 50% of the compound layer is made up of chromium. This
distribution % increases to a depth of about 1 micron. Then it begins to
fall off, but even at 4.5 microns, there are still significant diffused chromium
and nitrogen elements present.

This graph shows distribution of elements in the compound Qab white layer..
The "X" axis shows the depth in microns
The "Y" axis shows the average weight %
Carbon is represented by the "blue" line
Nitrogen is represented by the "red" line
Chromium is represented by the "green" line