花了好多時間用EXCEL去建立保護協調曲線，EXCEL是非常好用的計算軟體，只要寫好計算式，再輸入儲存格內的數字，便可得到計算結果。
用在畫曲線，是將計算結果列出後轉為曲線，在對數表上表現出來。
I spent a lot of time to build protection coordination curve with EXCEL.
It is very useful to calculate. You as long as wrote formula in advance, and
enter figures within the cells, then you can get the results.
To show Coordination Curve on the log-log paper after transferring the
calculation results into a curve.
