Undocumented quadrupole fringe option

[bogomyag]

The command below shows that quadrupole has two parameters related to fringe "kill_ent_fringe" and "kill_exi_fringe". Setting them true, I assume, means no fringe for specific quadrupole in PTC tracking. However, it is not documented in the manual. Am I correct in my assumption? Also, what are "permfringe" and "bend_fringe"?

help,quadrupole; parameter: permfringe logical: false parameter: bend_fringe logical: false parameter: kill_ent_fringe logical: false parameter: kill_exi_fringe logical: false

Thank you, Anton