         @xAxis = d3.svg.axis()
             .scale(Trans.x2X)
             .orient("bottom")
-            .tickValues([-0.5, 0, 0.5])
+            .tickValues([-1, 0, 1])
             .outerTickSize([0])
 
         @yAxis = d3.svg.axis()
             .scale(Trans.y2Y)
             .orient("left")
-            .tickValues([-0.5, 0, 0.5])
+            .tickValues([-1, 0, 1])
             .outerTickSize([0])
 
 class Histo extends d3Object

            .attr("cx", Xm)
            .attr("cy", Ym)

        @line1 = @roofLine(-0.5, -0.5)
            .attr("x2", Xm)
            .attr("y2", Ym)

        @line2 = @roofLine(0.5, 0.5)
            .attr("x2", Xm)
            .attr("y2", Ym)


        chartArea.append("g")
            .attr("class", "axis")
            .attr("transform", "translate(#{margin.left}, #{margin.top+height-110})")
                .call(@xAxis) 

        chartArea.append("g")
            .attr("class", "axis")
