R help - May 2009 - Variogram: Tollerance in lag and angle

Dear all, i have my dataset (x,y,zvalue) and I will change tollerance in lag 
and in angle of the variogram.
I usa gtat and variogram. What I must change for 
the lag: width o cutoff?And for the angle tollerance?
This is that i have:


dati<-read.table("a.dat")

coordx<-dati[,1]

coordy<-dati[,2]

valuecd<-dati[,
5]

xycd<-data.frame(x=coordx,y=coordy,z=valuecd)

g<-gstat(id="cd",formula=(z)
~1,locations=~x+y,data=xycd)

cdvaromnidirectional=variogram(g)


cdvardirectional=variogram(g,alpha=c(22.5,67.5,112.5,157.5),width=0.1)

I must 
continue......