<?xml version="1.0" encoding="UTF-8" standalone="no"?><image-reference xmlns:xt="urn:xpressauthor:trackchanges" id="_c247d15e-90fe-479c-a4a8-220f6ff889c3"><num>11.3.3a</num><title id="_e28f06ef-c0f5-462c-ae99-4868df5bcc9a">Barriers — when required</title><image alt="Barriers — when required" height="709" heightdpi="200" href="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/11-3-3a-barriers-when-required.svg" longdescref="(a) barrier not required. (b) barrier required." width="1200" widthdpi="200"/></image-reference>