Defect Cost Increase

Hello.

On page 99. in XPE2E, there's an explanation on DCI and two graphs
describing it.

What is the y-axis of the graphs? I guess it is the number of defects.
The x-axis is time. So the thin line means the total number of defects
in the system over the time and the bar the number of found and fixed
defects during testing. Am I right on this?

The problem is that the diagrams are a bit confusing w.r.t the
context. On the page, the book is explaining what DCI is and then the
diagrams show up. I thought, at fisrt, the y-axis had been about the
cost of defect (finding and fixing) since we are talking about d-C-i,
but the curve has to be exponential rather than linear. "What am I
missing?"

If there were another line overlapped in those two diagrams, depicting
the exponential increase of the cost, wouldn't it be better to understand?





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