My original legend is

matplot(c,cbind(ES5,ES75,chisq,t),type ='l', col=c("brown","red","blue","black"),ylab='power')

legend(5,0.7,paste(c("0.5th ES test","0.75th ES test", "Chi-square test", "t test")),col=c("brown","red","blue","black"),lty=1:4,cex=1)

I would like to change "Chi-square" to the greek letter chi^2, how could I do it in R?

Thanks,

Kate 
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