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about seed layout

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Graph.md
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@@ -210,8 +210,23 @@ hierarchy attributes to group nodes.
A continuous graph layout algorithm. Read more details about the algorithm and its settings in the
[article][3]. The algorithm works iteratively. When you choose ForceAtlas2 layout or run the query,
it is automatically run 50 iterations of the algorithm. You can change the amount of steps run
automatically in `Initial Iterations`. You can also run and stop the algorithm manually by
clicking `Start`/`Stop` button.
automatically in `Initial Iterations`.
If you want to see the effect of further iterations, click `Continue`.
Click `Pause` to stop the algorithm run.
The graph must have an initial layout before running ForceAtlas2 algorithm.
Different initial layout lead to different result. You can choose an initial
layout in `Seed layout` fold.
Note that to see the effect of another seed layout you need to restart the
algorithm by clicking `Restart` button. It will make iterationы in the amount
of `Initial Iterations` setting.
Also note that seed layout will not be applied if the graph already had a layout
other than ForceAtlas2. For example, if you first applied the random layout and
then switched to ForseAtlas2. Click `Restart` button to make the algorithm
start from the beginning using the seed layout.
![Fig. 4: ForceAtlas2 layout](./img/Screenshot_graph_force_atlas2.png)