how to set bandwidth?

hello

These are my first steps with mean shift, so please be gentle.

I've tried using msc on a very small dataset with 6 points
1,1,1
1,3,1
1,5,1
1,10,1
1,11,1
1,12,1

Can anyone help me calculate a suitable "bandwidth" value that will yield 2 clusters , points 1-3 in the first cluster , points 4-6 in the second.

thanks,
Omer.