WSJT-X/lib/flat1.f90

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subroutine flat1(savg,iz,nsmo,syellow)
real savg(iz)
real syellow(iz)
real x(8192)
ia=nsmo/2 + 1
ib=iz - nsmo/2 - 1
nstep=20
nh=nstep/2
do i=ia,ib,nstep
call pctile(savg(i-nsmo/2),nsmo,50,x(i))
x(i-nh:i+nh-1)=x(i)
enddo
x(1:ia-1)=x(ia)
x(ib+1:iz)=x(ib)
x0=0.001*maxval(x(iz/10:(9*iz)/10))
syellow(1:iz)=savg(1:iz)/(x(1:iz)+x0)
return
end subroutine flat1