#HADAT TROPICS
	url="http://hadobs.metoffice.com/hadat/hadat2/hadat2_monthly_tropical.txt"
	hadat=read.table(url,skip=20)
	names(hadat)=scan(url,skip=18,n=11,what="")
	hadat=ts(hadat[,3:11],start=c(hadat[1,2],1),freq=12)
	temp= (hadat== -999); hadat[temp]=NA
	K=ncol(hadat)
	id=dimnames(hadat)[[2]];n=nchar(id)
	alt=as.numeric(substr(id,1,n-3))