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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.