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tickPositioner: function () {
           var max         = Math.max(Math.abs(this.dataMin), Math.abs(this.dataMax));
           var digitNumber = String(max).length - 2;
           var div         = Math.pow(10, digitNumber);
           var ceilMax     = Math.ceil(max / div) * div;
           return [-1, -0.75, -0.5,-0.25, 0, 0.25, 0.5, 0.75, 1].map(function (n) {
               return Math.round(ceilMax * n);
           });