This certainly did the trick, Thanks Ted, Sean, Romain, Dimitris, Lian and Andy,
> alnlength<-rchisq(1000,4)
> x<-0.25*(0:100)
> hist(alnlength,breaks=0.25*(0:100))
> lines(x,1000*dchisq(x,4)*0.25)
And apologies for my "newbieness" in the posting,
Albert.
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