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The topo data frame has 52 rows and 3 columns, of topographic heights within a 310 feet square.
topo
This data frame contains the following columns:
x
x coordinates (units of 50 feet)
y
y coordinates (units of 50 feet)
z
heights (feet)
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.