Problems of Spontaneous Emission, thanks.

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How to change the upper step to lower step on the figure?
Why does N2(0) change to N2(t) the exp(-t/21) will be missed?
Thanks.
Step.jpg
 
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This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
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