[R] Query on 3d plotting pacakges

[Neotropical bat risk assessments]

Hi all,

Fumbling around trying to find a plot package to do 3D plots.
This will be an aid to separating bats by their vocal signatures.
What I need to do is plot *Fc *against *Sc* with the third dimension 
being the *density* of the data points in the Fc-Sc plot.

Data format is like this abbreviated sample.  Fc is a frequency in kHz 
and Sc is the characteristic slope  (octaves per second) of each call pulse.

Any suggestions, guidance greatly appreciated.
Bruce

Fc 	Sc
26.58 	-5.95
27.03 	-8.2
27.16 	-2.07
26.19 	-7.68
26.62 	-3.99
26.85 	-6.08
26.94 	0
26.1 	-5.74
26.62 	-5.96
26.85 	-4.05
26.98 	-4.09
26.02 	-5.69
26.53 	-7.89
26.62 	-2
26.8 	-4.04
28.73 	7
25.72 	-2.97
26.14 	-5.76
26.32 	-3.89
26.4 	0
26.32 	5.88


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