You can adjust the gaps in between using the Sub selection tool. Just click on the boundary using the subselection tool, it'll bring up the contour and anchor points that you can reshape and adjust as you wish.
Let me know if you still face difficulties.
谢谢，但是我说的是IK骨骼.Thank you, but I am IK bones
Yes I understand that. The Sub-selection tool works with IK Objects as well!
I just tried it out myself before suggesting.