# 9. Density of states calculation

In this section we introduce density of states (DOS) calculations. Note
that the DOS can always be calculated at the end of a self-consistent
calculation by setting `dos.status`

equal to true. However, obtaining
a fine-grained DOS generally requires a much finer k-sampling than
converging the total energy or ground state density does. It is thus
usually more efficient to calculate the DOS in a separate
non-self-consistent calculation, hence the need for a specific DOS
calculation type.