[R-sig-Geo] odd behaviour of llgridlines() regarding axes labels

[Agustin Lobo]

I see an odd behaviour of llgridlines() regarding axes labels:

require(rgdal)
require(raster)
a <- extent(c(-90,-81.5625,8.407168,16.63619))
a <- as(a, 'SpatialPolygons')
projection(a) <- "+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84
+towgs84=0,0,0"

No axis labels on x axis:
plot(a,axes=FALSE)
llgridlines(a, plotLines=TRUE, plotLabels=TRUE)

#same with:
plot(a,axes=FALSE,mar=c(4, 3, 2, 3)+0.1)
llgridlines(a, plotLines=TRUE, plotLabels=TRUE)

#and 2 vertical axes with:
plot(a,axes=TRUE)
llgridlines(a, plotLines=TRUE, plotLabels=TRUE)

Any hint?

Thanks
Agus