d3.js - Make stacked area chart overlapping area -


this stacked area chart mike bostock appears misleading me. example, if @ numbers on yaxis, appears (to me) monday 23, lightest blue area has total of approximately 95 or 96, if @ data, total light blue (which group 3) 46 monday 23. why that? because areas stacked ontop of each other, wheras yaxis gives impression (in opinion), example, area @ top of stack includes numbers below (hence reading of 96 group 3 on monday january 23).

my question is, how can graph (code , data below) changed works way interpreted it, raw data area that's ontop includes totals below. not correct term it, want make stacked area chart "overlapping" instead.

var format = d3.time.format("%m/%d/%y");  var margin = {top: 20, right: 30, bottom: 30, left: 40},     width = 960 - margin.left - margin.right,     height = 500 - margin.top - margin.bottom;  var x = d3.time.scale()     .range([0, width]);  var y = d3.scale.linear()     .range([height, 0]);  var z = d3.scale.category20c();  var xaxis = d3.svg.axis()     .scale(x)     .orient("bottom")     .ticks(d3.time.days);  var yaxis = d3.svg.axis()     .scale(y)     .orient("left");  var stack = d3.layout.stack()     .offset("zero")     .values(function(d) { return d.values; })     .x(function(d) { return d.date; })     .y(function(d) { return d.value; });  var nest = d3.nest()     .key(function(d) { return d.key; });  var area = d3.svg.area()     .interpolate("cardinal")     .x(function(d) { return x(d.date); })     .y0(function(d) { return y(d.y0); })     .y1(function(d) { return y(d.y0 + d.y); });  var svg = d3.select("body").append("svg")     .attr("width", width + margin.left + margin.right)     .attr("height", height + margin.top + margin.bottom)   .append("g")     .attr("transform", "translate(" + margin.left + "," + margin.top + ")");  d3.csv("data.csv", function(error, data) {   if (error) throw error;    data.foreach(function(d) {     d.date = format.parse(d.date);     d.value = +d.value;   });    var layers = stack(nest.entries(data));    x.domain(d3.extent(data, function(d) { return d.date; }));   y.domain([0, d3.max(data, function(d) { return d.y0 + d.y; })]);    svg.selectall(".layer")       .data(layers)     .enter().append("path")       .attr("class", "layer")       .attr("d", function(d) { return area(d.values); })       .style("fill", function(d, i) { return z(i); });    svg.append("g")       .attr("class", "x axis")       .attr("transform", "translate(0," + height + ")")       .call(xaxis);    svg.append("g")       .attr("class", "y axis")       .call(yaxis); });

data

key,value,date group1,37,04/23/12 group2,12,04/23/12 group3,46,04/23/12 group1,32,04/24/12 group2,19,04/24/12 group3,42,04/24/12 group1,45,04/25/12 group2,16,04/25/12 group3,44,04/25/12 group1,24,04/26/12 group2,52,04/26/12 group3,64,04/26/12


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