spacebox()

Description:
Create a scatter plot of square-root or squared differences between variable values at pairs of points versus the distance between the points.

Usage:
spacebox(point.obj, pairs.obj, v1, v2=v1, type='r')

Required arguments:
point.obj: a point object generated by point()
pairs.obj: a pairs object generated by pairs()
v1: a variable to plot

Optional arguments:
v2: an optional variable name, if entered the plot will be created between v1 and v2
type: either 'r' for square-root differences or 's' for squared differences

Value:
NULL

Examples:
> spacebox(stations, stations.prs, 'inches')

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