Electronic density will be calculated by the following formula

\begin{equation} \sum_i O_{ii} \chi_ii(t) + 2 \sum_{i>j} O_{ij} Re{\chi_{ij}(t)} \end{equation}

File with time-dependent density matrix elements must be in the following format:

#!python

Time      <1|1>     <1|2>      <2|2>
0.0        0.5       0.3        0.2