Comparison Scatter Plot
Produces a side-by-side scatter plot.
sideBySideScatterPlot(object, x.fun, y.fun, ...)
object | 
 a   | 
x.fun | 
 a function to extract the x-axis quantity.  | 
y.fun | 
 a function to extract the y-axis quantity.  | 
... | 
 additional arguments.  | 
the trellis object is invisibly returned.
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