Use tall destination preview volume

README.md

@@ -26,7 +26,7 @@ right-clicking with an empty hand. Sneak-right-click with an empty hand to take
 the book back and restore the vanilla lectern. Breaking a Book Stand drops both
 the stored book and a vanilla lectern.
 
-Bound Linking Books request a server-validated 17-by-7-by-17 snapshot around
+Bound Linking Books request a server-validated 9-by-128-by-9 snapshot around
 their destination and render its blocks as a rotating Ponder scene on the left
 page, backed by the destination biome's sky color. The snapshot is visual only;
 the server independently validates every link.