WSJT-X/lib/flat1a.f90

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subroutine flat1a(psavg,nsmo,s2,nh,nsteps,nhmax,nsmax)
real psavg(nh)
real s2(nhmax,nsmax)
real x(8192)
ia=nsmo/2 + 1
ib=nh - nsmo/2 - 1
do i=ia,ib
call pctile(psavg(i-nsmo/2),nsmo,50,x(i))
enddo
do i=1,ia-1
x(i)=x(ia)
enddo
do i=ib+1,nh
x(i)=x(ib)
enddo
do i=1,nh
psavg(i)=psavg(i)/x(i)
do j=1,nsteps
s2(i,j)=s2(i,j)/x(i)
enddo
enddo
return
end subroutine flat1a