do i=ibondp_start,ibondp_end
diff = vbld(i)-vbldp0
c write (iout,*) i,vbld(i),vbldp0,diff,AKP*diff*diff
+ if (energy_dec) write (iout,'(a7,i5,4f7.3)')
+ & "estr bb",i,vbld(i),vbldp0,diff,AKP*diff*diff
estr=estr+diff*diff
do j=1,3
gradb(j,i-1)=AKP*diff*dc(j,i-1)/vbld(i)
diff=vbld(i+nres)-vbldsc0(1,iti)
c write (iout,*) i,iti,vbld(i+nres),vbldsc0(1,iti),diff,
c & AKSC(1,iti),AKSC(1,iti)*diff*diff
+ if (energy_dec) write (iout,*)
+ & "estr sc",i,iti,vbld(i+nres),vbldsc0(1,iti),diff,
+ & AKSC(1,iti),AKSC(1,iti)*diff*diff
estr=estr+0.5d0*AKSC(1,iti)*diff*diff
do j=1,3
gradbx(j,i)=AKSC(1,iti)*diff*dc(j,i+nres)/vbld(i+nres)