/// <summary>
/// Creates a category that has the same value for both minimum and maximum
/// </summary>
/// <param name="value">The value to use</param>
public Category(double value)
{
_range = new Range(value);
}
/// <summary>
/// Creaates a new instance of this category, and tailors the range to the specifeid values.
/// </summary>
/// <param name="startValue">The start value</param>
/// <param name="endValue">The end value</param>
public Category(double? startValue, double? endValue)
{
_range = new Range(startValue, endValue);
}