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if(Event.SourceType == "FLUID_DETECTOR" && Event.SourceId == "1" && Event.Action == "FLUID_ACTION") 
{
 var L = Event.GetParam("param0");
 L=100-L*100; //the L parameter sets the line height
 DoReactStr("MONITOR","","SET_MARKRECT","cam<"+cam+">,color<255>,id<"+cam+">,x1<"+x1+">,x2<"+x2+">,y1<"+L+">,y2<"+y2+">");
 //  координатыcoordinates x1, x2, y1, y2 set line position in the Surveillance window
}