%mem=500MB
%nproc=1
%chk=/work/callan/but/.../dd_data
#P CAS(4,4,nroot=2)/sto-3g nosymm freq guess=read

butadiene high precision freqs. Start with opt(symmetrised), SAOs, STO3G.

0 1
 C                  0.62021600   -0.40979300    0.00000000
 C                 -0.62021600    0.40979300    0.00000000
 C                 -1.86350400   -0.11270300    0.00000000
 C                  1.86350400    0.11270300    0.00000000
 H                 -0.48669200    1.48517300    0.00000000
 H                 -2.74393300    0.51408300    0.00000000
 H                  2.03118600    1.18071400    0.00000000
 H                 -2.03118600   -1.18071400    0.00000000
 H                  0.48669200   -1.48517300    0.00000000
 H                  2.74393300   -0.51408300    0.00000000