two_colors=c('darkorange2','firebrick') ggplot(data, aes(Aster_experience, R_experience)) + geom_point(aes(size=coverage, color=product)) + geom_text(aes(label=product), size=5, nudge_x=0.0, nudge_y=-0.15) + geom_hline(yintercept=0) + geom_vline(xintercept=0) + labs(x="Aster Experience", y="R Experience", title="R Packages for Teradata Aster") + scale_x_continuous(limits=c(-1,1), breaks=c(-.8,.8), labels=c('less','more')) + scale_y_continuous(limits=c(-1,1), breaks=c(-.8,.8), labels=c('less','more')) + scale_size(range=c(15,20)) + scale_color_manual(values=two_colors, guide="none") + theme(axis.text.y = element_text(angle = 90, hjust = 1), axis.ticks = element_blank(), axis.text=element_text(size=12), axis.title=element_text(size=14,face="bold"), plot.title=element_text(size=18, vjust=1))