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Salt profiles taken over a spatial grid set out on an agricultural field, 64 rows at 17-ft spacing.
data(salt)
The format is: Time-Series [1:64] from 1 to 64: 6 6 6 3 3 3 4 4 4 1.5 ...
pairs with saltemp, temperature profiles on the same grid
saltemp
http://www.stat.pitt.edu/stoffer/tsa4/