[R] Need help on ploting Histograms

[Bonna]

this is the command i made for a normal distribution, but when i try to plot
the histograms, i dont know why the bars don't stick on the line...

nsamples<-1000
sampsize<-15
Samples<-matrix(rnorm(nsamples*sampsize,0,1),nrow=nsamples) 
a<-apply(Samples,1,var)
NC14<-a*14
x<-0:40
plot(x,dchisq(x,14),type='h') 
hist(NC14,freq=F,add=T)
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