code: function w(d, outer) {
  		var width = self.options.cellSize*self._domainType[self.options.subDomain].column(d) + self.options.cellPadding*self._domainType[self.options.subDomain].column(d);
  		if (arguments.length === 2 && outer === true) {
  			return width += self.domainHorizontalLabelWidth + self.options.domainGutter + self.options.domainMargin[1] + self.options.domainMargin[3];
  		}
  		return width;
  	}
docs: Return the width of the domain block, without the domain gutter @param int d Domain start timestamp