WSJT-X/flat2.f

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subroutine flat2(ss,n,nsum)
real ss(1024)
real ref(1024)
real tmp(1024)
nsmo=20
base=50*(float(nsum)**1.5)
ia=nsmo+1
ib=n-nsmo-1
do i=ia,ib
call pctile(ss(i-nsmo),tmp,2*nsmo+1,50,ref(i))
enddo
call pctile(ref(ia),tmp,ib-ia+1,50,base2)
if(base2.gt.0.1*base) then
do i=ia,ib
ss(i)=base*ss(i)/ref(i)
enddo
endif
return
end