Great job. I would like to add one fine point.
Your syntax does generate Value Order in the order of the values found in the current data table, it does not set Row Level Order. The fine point is that if you would sort the data, and then perform an analysis or create a chart, the order of the values for your Tamb_Est would remain the same order as before the sort. If you had set Row Order Levels, the data would be displayed in the new sorted order.
Jim