I am inclined to conclude that your installation has some issues, since this is the output I just got from NWChem 6.6. What version of NWChem have you been using?
Limits (a.u.) specified for the density plot:
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From To # of spacings
X -5.66918 5.66918 10
Y -5.66918 5.66918 10
Z -5.66918 5.66918 10
Total number of grid points = 1331
1-st set of MOs : n2.movecs
Output is written to : chargedensity.cube
Type of picture : CHARGE DENSITY
Format used : Gaussian9x Cube
Spin : TOTAL
The density is computed using all orbitals
The density is computed on the specified grid
max element 41.440006815649994
Tol_rho = 0.10000E-39
Sum of elements = 88.48768
Integration volume = 1.45764
Integrated Charge = 128.98328
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