problem on removing labels on a contour

[Zibiao Zhang <zibiao.zhang@xxxxxxx>]

Dear All!
 
I had a contour plot, and I removed the labels successfully, however, the color has gone with the labels, Any body knows what is the problem?
my script is:

contour/fill/title=''/i/j/k/set  var
go unlabel 1; ... go unlabel 6;
ppl contour

Another problem is how can I use the space freed from labels to the plot?

thanks.