<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="255"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="255"/>
_label="Reaction" low="-1" high="2" default="-1"/>
<number id="diffusion" type="spinbutton" arg="-diffusion %"
_label="Diffusion" low="-1" high="2" default="-1"/>
_label="Reaction" low="-1" high="2" default="-1"/>
<number id="diffusion" type="spinbutton" arg="-diffusion %"
_label="Diffusion" low="-1" high="2" default="-1"/>
<!-- #### default is wrong -->
<number id="radius" type="spinbutton" arg="-radius %"
_label="Seed radius" low="-1" high="60" default="-1"/>
</vgroup>
<!-- #### default is wrong -->
<number id="radius" type="spinbutton" arg="-radius %"
_label="Seed radius" low="-1" high="60" default="-1"/>
</vgroup>
-Draws a grid of growing square-like shapes that, once they overtake
-each other, react in unpredictable ways. "RD" stands for
-reaction-diffusion.
+Reaction-diffusion: draws a grid of growing square-like shapes that,
+once they overtake each other, react in unpredictable ways.