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I read that the Vulcanoid zone extends out to 0.21 a.u., why do you use 0.18 a.u. as the outside stable limit?

April 26, 2017a.u extends limit outside read STABLE vulcanoid zone

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I read that the Vulcanoid zone extends out to 0.21 a.u., why do you use 0.18 a.u. as the outside stable limit?

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According to Dr. Durda (Southwest Research Institute), Neil Wyn W. Evans (University of Oxford) and Serge A. Tabachnik (Princeton University Observatory) revised their model a changed the outside edge of the Vulcanoid zone from 0.21 a.u. to 0.18 a.u. They found that while objects out to 0.21 a.u. might be stable on the order of a 100 MYr, they are not stable for several Gyr. Any long term stable Vulcanoids that have remained in their orbit since the formation of our solar system (age > 4.5 Gyr) must reside inside the 0.18 a.u. limit.