context:     setYConstraint: function(iUp, iDown, iTickSize) {        this.topConstraint = iUp;        this.bottomConstraint = iDown;        this.minY = this.initPageY - iUp;        this.maxY = this.initPageY + iDown;        if (iTickSize) { this.setYTicks(this.initPageY, iTickSize); }        this.constrainY = true;    },
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