do i=ithet_start,ithet_end
C Zero the energy function and its derivative at 0 or pi.
call splinthet(theta(i),0.5d0*delta,ss,ssd)
do i=ithet_start,ithet_end
C Zero the energy function and its derivative at 0 or pi.
call splinthet(theta(i),0.5d0*delta,ss,ssd)