TH1F :
histograms with one float per channel. Maximum precision 7 digits
Quit root (just in case)
root[0]>.q
Display the browser
root[1]>TBrowser b;
C++ 在root中使用时，基本规则不变只是具体的写法有些区别
具体为
第一个字母大写，然后加上"_t"
例如：
int-->Int_t
double-->Double_t
char-->Char_t
which I think it is totally stupid , but anyway , I need to follow their
rules if I want to use it.
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