Friends,
I want to draw concentric circles of increasing sizes around the
protein. To achieve this, i used the 'define plane' option to draw
disk choosing I three reference atoms and drew the disks of increasing
sizes and choose two different color for the inner and outer disk.
Since the reference atoms are the same. If i change the color of the
bigger disk, i get a weird appearance of the inner disk. I dnt know
how to resolve this problem.

I would like to know if i can do something like making the disk
transparent/removing the fill color of the disk.

thanks,
Bala