<number id="z" type="slider" arg="-observer-z %"
_label="Zoom" _low-label="Near" _high-label="Far"
low="1.125" high="10.0" default="3.0"/>
<number id="z" type="slider" arg="-observer-z %"
_label="Zoom" _low-label="Near" _high-label="Far"
low="1.125" high="10.0" default="3.0"/>