integer nres,nsup,nstart_sup,nz_start,nz_end,iz_sc,
& nres0,nstart_seq
double precision c,dc,dc_old,d_c_work,xloc,xrot,dc_norm,t,r,
- & prod,rt,dc_work,cref,crefjlee
+ & prod,rt,dc_work,cref,crefjlee,dc_norm2
common /chain/ c(3,maxres2+2),dc(3,0:maxres2),dc_old(3,0:maxres2),
& xloc(3,maxres),xrot(3,maxres),dc_norm(3,0:maxres2),
+ & dc_norm2(3,0:maxres2),
& dc_work(MAXRES6),nres,nres0
common /rotmat/ t(3,3,maxres),r(3,3,maxres),prod(3,3,maxres),
& rt(3,3,maxres)