Hi 

I am struggling with the correct code syntax to generate xyplots that are 
different from the default graphics option.

This is simplified version of my data:

site	size	dnaconc	prey
A	44	22.6		1
A	47	18.2		1
B	38	25.6		0
B	47	20.5		1
C	45	30.5		0
C	32	18.5		0
D	45	15.0		1
D	22	20.1		0

So I am using xyplot(dnaconc~size|site,data=bug,groups=prey) to generate
4 panels (one for each site). 

My questions are:

(1) How do I display different groups(ie prey) within each panel with
different symbols (e.g. pch 19 and 24)

(2) How do I draw a key that displays the same symbols as specified in
the panels?

(3)  how do I resize the key border at the top and bottom to properly
include key text?

(4) How do I include some space between the panels? (I have tried using
the argument "between" but cannot seem to get it to work).

(5) How do I change the device setting to postscript? (I have tried using 
the argument par.setting=list(theme='postscript'). 


Cheers
Abe



Abraham Passmore
PhD student
Institute of Antarctic and Southern Oceans Studies (IASOS)
University of Tasmania
Australia


