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+.. _plovasp:
+
+PLOVasp input file
+==================
+
+The general purpose of the PLOVasp tool is to transform
+raw, non-normalized projectors generated by VASP into normalized
+projectors corresponding to user-defined projected localized orbitals (PLO).
+The PLOs can then be used for DFT+DMFT calculations with or without
+charge self-consistency. PLOVasp also provides some utilities
+for basic analysis of the generated projectors, such as outputting
+density matrices, local Hamiltonians, and projected
+density of states.
+
+PLOs are determined by the energy window in which the raw projectors
+are normalized. This allows to define either atomic-like strongly
+localized Wannier functions (large energy window) or extended 
+Wannier functions focusing on selected low-energy states (small
+energy window).
+
+In PLOVasp all projectors sharing the same energy window are combined
+into a `projector group`. Technically, this allows one to define
+several groups with different energy windows for the same set of
+raw projectors. Note, however, that DFTtools does not support projector
+groups at the moment but this feature might appear in future releases.
+
+A set of projectors defined on sites realted to each other either by symmetry
+or by sort along with a set of `l`, `m` quantum numbers forms a
+`projector shell`. There could be several projectors shells in a
+projector group, implying that they will be normalized within
+the same energy window.
+
+Projector shells and groups are specified by a user-defined input file
+whose format is described below.
+
+Input file format
+-----------------
+
+The input file is written in the standard config-file format.
+Parameters (or 'options') are grouped into sections specified as
+`[Section name]`. All parameters must be defined inside some section.
+
+A PLOVasp input file can contain three types of sections:
+
+#. **[General]**: includes parameters that are independent
+   of a particular projector set, such as the Fermi level, additional 
+   output (e.g. the density of states), etc.
+
+#. **[Group <Ng>]**: describes projector groups, i.e. a set of
+   projectors sharing the same energy window and normalization type.
+   At the moment, DFTtools support only one projector group, therefore
+   there should be no more than one projector group.
+
+#. **[Shell <Ns>]**: contains parameters of a projector shell labelled
+   with `<Ns>`. If there is only one group section and one shell section,
+   the group section can be omitted and its required parameters can be
+   given inside the single shell section.