[R] Add title to color spectrum legend in xyplot

[Nick Ackerman]

Hi,

I have a plot that is essentially the same as that in Figure 5.6 of "Lattice
- Multivariate Data Visualization with R". The key difference is that I
would like to add a title to top of the grey color spectrum legend, but have
thus far been unsuccessful. I've tried a variety of options, but to no
avail. I'm new to R, and admittedly I don't understand the "legend" argument
that well, and in this case how it interacts with the "key" argument. Thanks
in advance for any help. For reference, here is the code to Figure 5.6. 

xyplot(lat ~ long | Magnitude, data = quakes.ordered, 
       aspect = "iso", groups = color, cex = 2, col = "black",
       panel = function(x, y, groups, ..., subscripts) {
           fill <- groups[subscripts]
           panel.grid(h = -1, v = -1)
           panel.xyplot(x, y, pch = 21, fill = fill, ...)
       },
       legend = 
       list(right = 
            list(fun = draw.colorkey,
                 args = list(key = list(col = gray.colors,
                                        at = depth.breaks), 
                             draw = FALSE))),
       xlab = "Longitude", ylab = "Latitude")

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