C Store the geometric variables in the following COMMON block.
      integer ntheta,nphi,nside,nvar,Origin,nstore,ialph,ivar,
     &        mask_theta,mask_phi,mask_side
      double precision theta,phi,alph,omeg,varsave,esave,varall,vbld,
     &          thetaref,phiref,costtab,sinttab,cost2tab,sint2tab,
     &          xxtab,yytab,zztab,xxref,yyref,zzref
      common /var/ theta(maxres),phi(maxres),alph(maxres),omeg(maxres),
     &          omicron(2,maxres),tauangle(3,maxres),
     &          vbld(2*maxres),thetaref(maxres),phiref(maxres),
     &          costtab(maxres), sinttab(maxres), cost2tab(maxres),
     &          sint2tab(maxres),xxtab(maxres),yytab(maxres),
     &          zztab(maxres),xxref(maxres),yyref(maxres),zzref(maxres),
     &          ialph(maxres,2),ivar(4*maxres2),ntheta,nphi,nside,nvar
C Store the angles and variables corresponding to old conformations (for use
C in MCM).
      common /oldgeo/ varsave(maxvar,maxsave),esave(maxsave),
     &  Origin(maxsave),nstore
C freeze some variables
      logical mask_r
      common /restr/ varall(maxvar),mask_r,mask_theta(maxres),
     &               mask_phi(maxres),mask_side(maxres)