; };
                var r = "date,parabola,line,another line,sine wave\n";
                for (var i=1; i<=31; i++) {
                r += "200610" + zp(i);
                r += "," + 10*(i*(31-i));
                r += "," + 10*(8*i);
                r += "," + 10*(250 - 8*i);
                r += "," + 10*(125 + 125 * Math.sin(0.3*i));
                r += "\n";
                }
                return r;
              },
              {
                rollPeriod: 1,
                labelsDiv: document