         @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

        x = Trans.X2x @pos.x
        y = Trans.fn x, plot.xm, plot.ym
        @limit =  Trans.y2Y y
        @bin = Math.floor((y+0.5)*20)  
 
    collision: -> @pos.y > @limit


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

        @line1 = @roofLine(-1, -1)
            .attr("x2", Xm)
            .attr("y2", Ym)

        @line2 = @roofLine(1, 1)
            .attr("x2", Xm)
            .attr("y2", Ym)

