_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"/>
<!-- #### default is wrong -->
<number id="radius" type="spinbutton" arg="-radius %"
_label="Seed radius" low="-1" high="60" default="-1"/>