+C below is zero grad for shielding in order: ees (p-p)
+C ecorr4, eturn3, eturn4, eel_loc, c denotes calfa,x is side-chain
+ gshieldx(j,i)=0.0d0
+ gshieldc(j,i)=0.0d0
+ gshieldc_loc(j,i)=0.0d0
+ gshieldx_ec(j,i)=0.0d0
+ gshieldc_ec(j,i)=0.0d0
+ gshieldc_loc_ec(j,i)=0.0d0
+ gshieldx_t3(j,i)=0.0d0
+ gshieldc_t3(j,i)=0.0d0
+ gshieldc_loc_t3(j,i)=0.0d0
+ gshieldx_t4(j,i)=0.0d0
+ gshieldc_t4(j,i)=0.0d0
+ gshieldc_loc_t4(j,i)=0.0d0
+ gshieldx_ll(j,i)=0.0d0
+ gshieldc_ll(j,i)=0.0d0
+ gshieldc_loc_ll(j,i)=0.0d0
+C end of zero grad for shielding