/span>  
<br><br>
<i>Optional</i><br>
Default: no<br><br>
Triggers the reading of an external Gaussian formatted checkpoint file (named gaussian.fchk) that contains density matrices. Basis sets have to be precisely the same in MOLGW and in Gaussian, which requires a manual input of the basis set in both codes. Options are 'no' (no reading), 'SCF' (for self-consistent field), 'CC' (for coupled-cluster), or 'MP2' (for MP2). Today, only works for Cartesian Gaussian and for spin restricted calculations.</li><br