[R] inserting mathematical symbols in lattice strip

[Andrewjohnclose]

I have tried without success to find a way including the square root symbol
in lattice strips as part of my conditioning labels. I have tried
supplementing by creating a list of vectors using the var.name function
coupled with the expression function used in xlab/ylab. 

xyplot(adjusted_Rand_index~cluster|distance_measure, main="Level of
agreement between partitions: Wards Method", ylab="Coefficient value
(adjusted rand index)", xlab="number of clusters", type="l", data=randA1, 
strip=strip.custom(varnames=c(expression(sqrt(Bray-Curtis))) 

Is there a way of generating the square root symbol inside the strip or am I
wasting my time. i.e. converting Bray-Curtis to ... [sqrt symbol]
Bray-Curtis.

Thank you very much 

Regards 

Andrew 
http://www.nabble.com/file/p17188291/randA1.csv randA1.csv 
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