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The order of collecting the values in most data sets is unimportant — any reordering of the values contains the same information.
If the order is important, an extra variable can be added to the data matrix to define the ordering. Select With variable indicating order from the pop-up menu to display such a variable for the two data sets.
The data are artificial. You should consider that chains were tested in the order shown and the annual rainfalls were from July 1993 to June 2005.