r - How to fill the black grid with big values in spplot -


i want know how fill color in black grids of following figure 1. value of blank grid greater 100. can fill color in blank grids, legend not symmetric. how modify? lot!

here scripts:

a<-spplot(nc.data,sp.layout = list("sp.lines", as(china, "spatiallines")), main="all",col.regions = cols(100), @ = seq(-120, 120, 20), +           colorkey = list( +               right = list( # see ?levelplot in package trellis, argument colorkey: +                   fun = draw.colorkey,  +                   args = list( +                       key = list( +                           @ = seq(-100, 100, 20), # colour breaks +                           col = bpy.colors(11), # colours +                           labels = c("\u2264 -100", "-50"  ,"0" ,  "50" ,   "\u2265 100") +                       ) +                   ) +               ) +           ), +            +          scales=list(draw = true),par.settings=list(fontsize=list(text=17)))

figure 1


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