subroutine chkss2(ss2,freq,drift,schk)
real ss2(0:8,85)
real s(0:8,85)
real s1(0:5)
include 'jt9sync.f90'
ave=sum(ss2)/(9*85)
s=ss2/ave-1.0
! call zplot9(s,freq,drift)
s1=0.
do lag=0,5
do i=1,16
j=ii(i)+lag
if(j.le.85) s1(lag)=s1(lag) + s(0,j)
enddo
schk=s1(0)/16.0
return
end subroutine chkss2
