// extra time for computation via extra unconnected cells
begintemplate XCell
public soma
create soma
proc init() {
	soma {
		insert hh
	}
}
endtemplate XCell

objref xcell_list
proc mk_extra_cells() {local i
	n_xcell = $1
	xcell_list = new List()
	for i=0, $1-1 {
		xcell_list.append(new XCell())
	}
}