/// <summary>
/// Remove the specified <see cref="Observation"/> to this <see cref="Category"/>.
/// Should be used only by <see cref="Observation.ResetCategory"/> in the <see cref="Observation"/> class.
/// </summary>
/// <param name="observation">The <see cref="Observation"/> to delete.</param>
internal void Remove(Observation observation)
{
Observations.Remove(observation);
}