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	type: null,
	
	/**
	 * If true, the items on the axis will be drawn in opposite direction.
	 *
	 * @property reverse
	 * @type Boolean
	 */
	reverse: false,
	
	/**
	 * A string reference to the globally-accessible function that may be called to
	 * determine each of the label values for this axis. Also accepts function references.
	 *
	 * @property labelFunction
	 * @type String
	 */
	labelFunction: null,
	
	/**
	 * The space, in pixels, between labels on an axis.
	 *
	 * @property labelSpacing
	 * @type Number
	 */
	labelSpacing: 2,
	
	/**
	 * The text that will appear next to the axis to indicate information about the data that it displays.
	 *
	 * @property title
	 * @type String
	 */
	title: null 
};

/**
 * A type of axis whose units are measured in numeric values.
 *
 * @namespace YAHOO.widget
 * @class NumericAxis
 * @extends YAHOO.widget.Axis
 * @constructor
 */
YAHOO.widget.NumericAxis = function()
{
	YAHOO.widget.NumericAxis.superclass.constructor.call(this);
};

YAHOO.lang.extend(YAHOO.widget.NumericAxis, YAHOO.widget.Axis,
{
	type: "numeric",
	
	/**
	 * The minimum value drawn by the axis. If not set explicitly, the axis minimum
	 * will be calculated automatically.
	 *
	 * @property minimum
	 * @type Number
	 */
	minimum: NaN,
	
	/**
	 * The maximum value drawn by the axis. If not set explicitly, the axis maximum
	 * will be calculated automatically.
	 *
	 * @property maximum
	 * @type Number
	 */
	maximum: NaN,
	
	/**
	 * The spacing between major intervals on this axis.
	 *
	 * @property majorUnit
	 * @type Number
	 */
	majorUnit: NaN,

	/**
	 * The spacing between minor intervals on this axis.
	 *
	 * @property minorUnit
	 * @type Number
	 */
	minorUnit: NaN,
	
	/**
	 * If true, the labels, ticks, gridlines, and other objects will snap to
	 * the nearest major or minor unit. If false, their position will be based
	 * on the minimum value.
	 *
	 * @property snapToUnits
	 * @type Boolean
	 */
	snapToUnits: true,
	
	/**
	 * Series that are stackable will only stack when this value is set to true.
	 *
	 * @property stackingEnabled
	 * @type Boolean
	 */
	stackingEnabled: false,

	/**
	 * If true, and the bounds are calculated automatically, either the minimum or
	 * maximum will be set to zero.
	 *
	 * @property alwaysShowZero
	 * @type Boolean
	 */
	alwaysShowZero: true,

	/**
	 * The scaling algorithm to use on this axis. May be "linear" or "logarithmic".
	 *
	 * @property scale
	 * @type String
	 */
	scale: "linear",
	
	/**
	 * Indicates whether to round the major unit.
	 * 
	 * @property roundMajorUnit
	 * @type Boolean
	 */
	roundMajorUnit: true 
});

/**
 * A type of axis whose units are measured in time-based values.
 *
 * @namespace YAHOO.widget
 * @class TimeAxis
 * @constructor
 */
YAHOO.widget.TimeAxis = function()
{
	YAHOO.widget.TimeAxis.superclass.constructor.call(this);
};

YAHOO.lang.extend(YAHOO.widget.TimeAxis, YAHOO.widget.Axis,
{
	type: "time",
	
	/**
	 * The minimum value drawn by the axis. If not set explicitly, the axis minimum
	 * will be calculated automatically.
	 *
	 * @property minimum
	 * @type Date
	 */
	minimum: null,

	/**
	 * The maximum value drawn by the axis. If not set explicitly, the axis maximum
	 * will be calculated automatically.
	 *
	 * @property maximum
	 * @type Number
	 */
	maximum: null,
	
	/**
	 * The spacing between major intervals on this axis.
	 *
	 * @property majorUnit
	 * @type Number
	 */
	majorUnit: NaN,
	
	/**
	 * The time unit used by the majorUnit.
	 *
	 * @property majorTimeUnit
	 * @type String
	 */
	majorTimeUnit: null,
	
	/**
	 * The spacing between minor intervals on this axis.
	 *
	 * @property majorUnit
	 * @type Number
	 */
	minorUnit: NaN,
	
	/**
	 * The time unit used by the minorUnit.
	 *
	 * @property majorTimeUnit
	 * @type String
	 */
	minorTimeUnit: null,

	/**
	 * If true, the labels, ticks, gridlines, and other objects will snap to
	 * the nearest major or minor unit. If false, their position will be based
	 * on the minimum value.
	 *
	 * @property snapToUnits
	 * @type Boolean
	 */
	snapToUnits: true,

	/**
	 * Series that are stackable will only stack when this value is set to true.
	 *
	 * @property stackingEnabled
	 * @type Boolean
	 */
	stackingEnabled: false
});

/**
 * A type of axis that displays items in categories.
 *
 * @namespace YAHOO.widget
 * @class CategoryAxis
 * @constructor
 */
YAHOO.widget.CategoryAxis = function()
{
	YAHOO.widget.CategoryAxis.superclass.constructor.call(this);
};

YAHOO.lang.extend(YAHOO.widget.CategoryAxis, YAHOO.widget.Axis,
{
	type: "category",
	
	/**
	 * A list of category names to display along this axis.
	 *
	 * @property categoryNames
	 * @type Array
	 */
	categoryNames: null,
	
	/**
	 * Indicates whether or not to calculate the number of categories (ticks and labels)
	 * when there is not enough room to display all labels on the axis. If set to true, the axis 
	 * will determine the number of categories to plot. If not, all categories will be plotted.
	 *
	 * @property calcualateCategoryCount
	 * @type Boolean
	 */