subroutine getdphi(qphi)
real qphi(12)
s=0.
c=0.
do i=1,12
th=i*30/57.2957795
s=s+qphi(i)*sin(th)
c=c+qphi(i)*cos(th)
enddo
dphi=57.2957795*atan2(s,c)
write(*,1010) nint(dphi)
1010 format('!Best-fit Dphi =',i4,' deg')
return
end