Just deactivate the Inherit permissions from parent objects option. If you do that, you can configure whether you keep all the inherited entries as few entries, or if you want to remove all the inherited entries from the ACL. You can easily change the propagation value..
Peaks which are too short may have been generated by noise and are discarded. You can sort the list according to the different columns by clicking on them. Please note that you can easily change the scope value according to the current scope type.