delZnm["tensor"] =
aspi^2*(-(cf*nm*tf)/(24*ep^2) + (13*cf*nm*tf)/(144*ep)) + 
 aspi^3*(((11*ca*cf*nm*tf)/216 + (cf^2*nm*tf)/96 + 
     cf*(-(nh*nm)/54 - (nl*nm)/54 - nm^2/108)*tf^2)/ep^3 + 
   ((-245*ca*cf*nm*tf)/1296 + (13*cf^2*nm*tf)/576 + 
     cf*((13*nh*nm)/324 + (13*nl*nm)/324 + (13*nm^2)/648)*tf^2)/ep^2 + 
   (cf*((nh*nm)/72 + (nl*nm)/72 + nm^2/144)*tf^2 + 
     cf^2*tf*((-49*nm)/864 - (nm*Zeta[3])/12) + 
     ca*cf*tf*((251*nm)/1296 + (nm*Zeta[3])/12))/ep);
