(dataserver_vizualisation)=
# Visualisation dedicated to uncertainties

{{root}} integrates many high level visualisation features, but some of them, devoted to statistics 
are missing.  As they are linked to data, it seemed relevant to develop them in this library. Many 
of the methods discussed throughout this section are in any case, based on the original {{root}} 
methods that produce plots from a `TTree`-object: the `TTree::Draw` method (and subsequently the 
`TTree::Scan` when dumping on screen the content of the `TDataServer`).

:::{admonition} Summary: `TTree::Draw` and `TTree::Scan` methods
:class: tip

- `TTree::Draw`(__const char*__ varexp="", __const char*__ select="", __Option_t*__ option="" )

    Draw the expression *varexp* for specified entries.

    Returns -1 in case of error or number of selected events in case of success.

    The list of the options is located on the 
    [THistPainter class](http://root.cern.ch/root/html/THistPainter.html) on the {{root}} website.

- `TTree::Scan`( __const char*__ varexp="", __const char*__ select="", __Option_t*__ option="" )

    Scan the expression *varexp* for specified entries.

    Returns -1 in case of error or number of selected events in case of success.
:::

These tree arguments are the same on the `TDataServer::draw` and `TDataServer::scan` methods.

```{toctree}
vizualisation/histogram
vizualisation/box_and_whisker
vizualisation/cdf_ccdf_curves
vizualisation/2d_contour_levels
vizualisation/2d_profile
vizualisation/2d_tufte
vizualisation/2d_pairs
vizualisation/cob_web
vizualisation/qq_plot
vizualisation/pp_plot
```