legend does not appear in all cases in a plot?

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The x and y ranges of your plot depend on your data, but the (first)
legend command hard codes coordinate values (-2, 0.5). These coordinate
values may not be near enough to you data values to see it.

Hello all,

Here I am with a plot issue - when I try to add legend it does not work at all times. Can someone tell me what's wrong with my code?

the following legend does not work!

plot(ts(tot_avg1[,1], freq=12, start=c(1981,12), end=c(2009,12)), ylim=c(min(tot_avg1[,1]), max(tot_avg1[,3])),
xlab="Time", ylab="SST (deg Celcius)", lty=2, col=2)      #red
lines(ts(tot_avg1[,2], freq=12, start=c(1981,12), end=c(2009,12)))   #black
lines(ts(tot_avg1[,3], freq=12, start=c(1981,12), end=c(2009,12)), lty=3, col=4) #blue
legend(-2, 0.5, c("Min", "Mean", "Max"), col=c(2,1,4), lty=c(2,1,3))

but, if i specify the position in words, like the one given below, it works!
legend("topright", c("Min", "Mean", "Max"), col=c(2,1,4), lty=c(2,1,3))

is there something i am missing here? 

Thanks,
Mahalakshmi
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Edzer Pebesma
Institute for Geoinformatics (ifgi), University of M?nster
Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de