Scaling of horizon chart on R

I have just started to learn R and I have created a horizon chart using R.

However, the axes are not appearing properly. Is there any way which I could make the chart bigger and easier to see?

This is the chart I created using horizonplot from the latticeExtra package.:

require(latticeExtra)

horizonplot(data, horizonscale = 10, colorkey = TRUE, layout = c(1, 27))

Thanks in advance for any help given!